Upgrading to GTX 460, but unsure of...

Yes your Q6700 will bottleneck GTX460 SLI, I would imagine by quite a noticeable amount.

The price difference between the 768MB and the 1GB isn't that much and its certainly worth it to go for the 1GB if you intend to get a 24" monitor.

4GB is plenty, adding any more won't increase performance as your not using all 4GB as it is.

I wouldn't do the 768MB version of the GTX 460 'personally'. It has less memory, a lower memory bandwidth, and less ROPs. The 1GB version is the "Real" GTX 460 in my opinion. It should effectively perform better.

Although your existing CPU would work fine with a single GTX 460, it would definitely need a pretty good OverClock to keep up with an SLI setup. Later, if you do indeed get an i7-920, you'll be fine.   Especially since the 920's OC fairly well.

Since your Acer P221W is a 1680x1050 resolution max, a single GTX 460 is more than sufficient for the time being.   When you upgrade to a 1920x1080 (or 1920x1200) 24" monitor later, that would be the time to do SLI.

if your going to do a CPU upgrade, you might as well wait and rebuild your system when you got everything you want.

If he gets a 460 now it could easily last him till he goes to upgrade, especially if he gets a SLI motherboard and gets another 460 in said upgrade.

I wouldn't purchase the 768MB version, I would get the one gig.

You are going to see a bottleneck there, but I don't think its going to be a big one.

The Q6700 is still pretty high up there, just overclock it a bit....

http://www.tomshardware.co.uk/best-gaming-cpu-core-i5-a...

GTS 450 xD

But the GTX 460 768MB is not bad at all, its acutally a good card. I don't think there is any gimmik there.

Wow, thanks for the quick responses!

I fully intend to get another SLI-ready mobo, for sure. Thus, I would be willing to get two cards before I upgrade my cpu and mobo, as they would both simply just pop over into my new one. I understand that my current Q6700 would bottleneck, but I was unsure if it would be to the effect that a second GTX 460 would show no noticeable increase in fps. From the responses, I assume then that it would, and there would be no point in purchasing a second one until I've upgraded other components?

And, again, thanks for the quick responses!  

There is always a bottleneck, or limiting factor. The question is, how do we get a balanced system?

The GTX460 looks like a very good card. The 1gb version gives you good value for the extra $20 or so, and I don't think that amoung should be an issue, I would go for it. The 1gb versions carry a lifetime warranty vs. 2 years for the smaller card.
The GTX460 scales well in sli, so that is good. GTX480 prices are coming down, and I think I would favor a single gpu solution, just so long as power and heat are not great concerns. Either will give you exceptional gameplay at 1920 x 1200. If you are considering overclocking them, why not get a superclocked version? They are priced just a bit higher, but you are guaranteed good binning, and a factory warranty.

I think you will end up with a balanced system with your current cpu and a GTX460. You can measure your system with the games you play to see if a cpu or graphics update is warranted. I like to suggest the following two tests:

1) Run your games, but reduce the resolution and eye candy to a minimum. This will simulate what will happen if you upgrade to a stronger graphics card. If your FPS improves, it indicates that your cpu is capable of driving a stronger graphics card to higher levels of FPS.

2) Keeping your graphics resolution and settings the same, reduce your cpu power. Do this by removing the overclock, or by using windows power management to set a maximum cpu% of perhaps 70%. If your FPS drops significantly, it indicates that your current cpu is a limiting factor, and that a faster cpu would help.

4gb of ram should be plenty unless you are doing lots of other things at the same time. Most programs are written to 32 bit specs which limits them to 2gb, 3gb max.
More never hurts, but I would not invest in DDR2 ram today.

Upgrading to a 24" monitor puts more pressure on the graphics card, and less on the cpu. That is the time when a second GTX460 might be in order.