120 gb minimum. easily use it all. the 120gb drives are considerably better performers than the smaller drives as well.
if you can spare the coin, 240gb would be very comfortable, and perform even better.
os, all programs including games (installed) go on your ssd for fast loading times. if you get 240gb you could make a temporary download folder on it as well. (stupid fast unrarring of movies and such.)
1. I wouldn't use less than a 120 GB SSD. Right now, one pf the cheapest is also one with the highest performance and it laso uses the longest extended life premium flash available......the Mushkin Chronos Deluxe. It's the only SSD with premium tishiba toggle mode flash at less than $1 per GB
3. Or get a hybrid ..... The Seagate Momentus loads windows in 17 seconds compared to an SSD's 16 seconds. This sounds like an attractive option for you as it saves a bunch of money and eliminates all the configuration and "how to I make stuff go where" issues.
Other than a few really oddball entries, SF-2281 'consumer' SSDs come in three flash flavors. Starting on the low end, you have IMFT 25nm asynchronous flash, a budget flash used in the Agility 3, Force 3, Chronos (non-Deluxe model) and a few other drives that in our testing perform at around the same level as last year's SF-1200 controlled drives when filled to 50 percent capacity. A majority of drives use IMFT 25nm synchronous flash; Vertex 3, Force GT, S511 and so on.
Synchronous flash, also called ONFi 2.x is really the first step for enthusiasts, especially now that prices have really dropped. The final flash type used is 3Xnm Toggle Mode flash from Toshiba, a form of ONFi 2.x without the JEDEC classification. 25nm IMFT is rated for around 5K P/E cycles and 3Xnm Toshiba Toggle Mode flash is rated for around twice as many. Even though we are talking about writing a lot of data for a very long time, the 3Xnm flash will still last even longer.
As you can see Chronos (no Deluxe) has plain ole entry level Flash ..... Only the Deluxe, Vertex 3 Max IOPS, Mercury Extreme Pro 6G avd Patriot Wildfire have premium 3Xnm Toshiba Toggle Mode Flash for super long life and extreme performance.
I think a 120gb SSD is reasonable as the only drive in the system.
I had one with the OS and 6-8 games, along with 4gb of photos. It used 80gb of the 110gb available.
I started to run out of room, and jumped on a good deal for a 180gb Intel 520 series.
If you will be storing large files like video's, then put them on a conventional hard drive.
All modern ssd's will perform about the same in normal usage.
It takes a synthetic benchmark to detect the difference.
That said, I think INtel 520/510/330 series and Samsung 830 series seem to be the most trouble free.