More RAM but weaker GPU or less RAM and Better GPU?

Definitely get a better Gpu.

For a gaming box prioritize GFX > CPU > MoBo > RAM > Storage

If ya have another $10 tho, I'd use a SSHD instead of a HD.

SSHD is a hard drive sdd combo its has its ups and downs a lot of people Bit#h about them because there no where near as fast as a SSD but there are people who recommend them as well. Its new Tech which is coming along but its far from what it could be. Wait save your money buy a SDD later use it for your OS= windows install and use a standard hard drive for games and storage.

It's a HD with a SSD "tacked on"

http://www.tweaktown.com/reviews/5748/seagate-desktop-2tb-sshd-st2000dx001-review/index9.html

With the increasing market penetration of the SSD, a lot of users have now had the chance to upgrade their PCs. Now we all know while SSDs offer massive benefits in terms of performance, they have always lacked in one area - capacity.

A situation like this left most power users using an SSD for their operating system, while still running a secondary mechanical drive for storage and games. A typical setup such as this would allow the OS to load very quickly, while leaving you stunned at how long it took to load a game. With the introduction of the Desktop SSHD, Seagate has again switched up the game, offering a substantial performance boost to those of you in this situation.

Now, if you are one that chooses to use a single drive for your operating system, and have held onto your standard desktop HDD for the benefit of capacity, the Desktop SSHD is calling your name. The 8GB of NAND cache in conjunction with Seagate's application optimized algorithms should offer a tremendous performance boost, and again the more you use, it the faster the drive will get, as it learns how you use your system.

In every case seen here today, the Seagate Desktop SSHD excels, whether it be a synthetic point and click benchmark like HD Tune or ATTO, or even application traces via PCMark 8, the drive just performs.

Click to expand...

If you are a benchmark maven then an SSHD won't impress. If you just care about the user experience, then you'd have a hard time telling the difference between an SSD and an SSHD. Both are noticeably faster than a HD. We have a desktop set up here with two SSDs, two SSHDs and a HD.

Windows Boot Times:
HD = 21.2 seconds
SSHD = 16.5 seconds
SSD = 15.6 seconds.

If you can tell the difference between 16.5 and 15.6 w/o a stopwatch, you're better than me. We also have routinely run AutoCAD and various games off each and no one has been able to tell the difference so far.

We also have two identical laptops, one with a SSD and another with an SSD + HD .... these are used in the field on job sites to create as-built drawings. After hours have also used them for gaming..... so far, no one can tell which is which.

Can you create a situation where the SSD can gain a significant advantage over the SSHD... certainly. Load enormously huge files or boot windows and auto open 10 programs or a browser with 30 windows side by side and you will see one finish well before the other. But if that's nothing you are going to do everyday, what's the point ? Having your OS on the SSD saves you 0.9 seconds of boot time; is that really significant ?

But you don't have an SSD, so that doesn't really matter. But with a HD, you will wait 50% longer for that boot to finish and that is significant and quite noticeable.

The problem is, an SSD with Windows on it doesn't do squat for your games that are stored on the HD. The SSHD will load them 50% faster than the Black and twice as fast as the Blue. We haven't bought a HD in 4 years for our own use or put one in any user builds. Everything gets either a SSHD or a SSD + SSHD.

But getting back to your build, you don't have an SSD in the build. So whether you get one later or not is irrelevant.

http://www.tomshardware.com/charts/hdd-charts-2013/-17-PCMark-7-Gaming,2915.html

SSHD - 9.76 MB/s score in gaming
WD Black = 6.34 MB/s
WD Blue = 4.01 MB/s

-As it stands now, your system will take at least 50% longer to boot on the WD Blue than it will on the SSHD. The HD we used is much faster than the Blue

-As it stands now, your games will run twice as fast off th SSD as they will off the WD Blue. The Blue in the test was a 500 GB platter and the newer 1 TB platters are faster but not as fast as the Black's 6.34 which the SSHD still beats by 50%.

-If you get a SSD in the future, and you buy a HD now, you will reduce your boot time by about a third; if you buy a SSHD now, your reduced 0.9 second boot time will not impact your user experience in any way. Either way, it will be the same.

-If you get a SSD in the future, and you buy a SSHD now, your gaming performance will still be much, much faster with the SSHD than if you originally bought the Hard Drive.

Frankly, I don't see the 50% longer boot time as being all that significant. But whether you get a SSD in the future or not doesn't change anything. Either way, your games (or at least most of them) will not be on the SSD so it goesn't really factor in. They will be on the HD or SSHD and on the SSHD they will be loading 50 - 100% faster.