OT
OK tong monitor na to, I just bought it a few weeks ago and wala akong masabi.
BTT
I currently have an ATI Radeon HD 4870 which I bought a few weeks ago and I have no complaints. Ive been playing on a native resolution of 1680x1050. even with anti aliasing games like Call of Duty 4, Devil May Cry and Unreal Tournament 3 have very smooth framerates. The ATI Radeon HD 4850 uses tha same chip the RV770 aside from a reduction in the core speed and the use of gddr3 instead of gddr5 its prettymuch the same product. and should give similar though a bit "lower" performance, but it doesnt mean your not getting a kick ass experience. since you said that you plan to get a smaller screen. this would be more than enough to run most games with blazing performance in your native resolution. in comparison you can get the performance of a 9800 GTX for less cost.
haha 4850 is great!been playing wioth my pc for about a week now, runs all my games great! on 1440x900 resolution
ra3, dmc4, assasins creed, cod5, nba2k9, fallout 3 all max settings! with max AA( 4 or 8, depends on availability)
crysis- cant say for sure since im using a config file/patch that emulates the ultra high setting but requires no AA becaue it enables the edge AA, looks great, plays great!
warhead and farcry- 1440x900 resolution 2xAA, high-ultra high setting, no lags!