I know you didnt mention it, to the person that said that an X1900 card would be to overkill for rts's! With my system in the sig I cannot run at a full 30fps all the time in C&C3 with everything all the way up. I can get close, but I run the game on all eye candy with 1 level of anti-aliasing when there are 3. So I am not only lacking in that area with my system, but also...I do not stay at 30 FPS all the time with it it does still drop to 22 - 23 depending on what is going on. World in conflict (given im in the beta) also cannot be ran at max settings. Dont even get me started on supreme commander...I mean seriously...you need a beast of a system for that RTS game...and 3rd I had never seen a 30fps cap on a game until I played C&C3, and to tell you the truth...I HATE it. I hope SC2 allows me to run @ 60fps as WC3 did because that is what I want...so In order for me to be able to run at 60 FPS in a game such as SC2 or 30 FPS in C&C3 with all Eye candy up I will need an upgraded system (or atleast...there is a good chance for SC2 that I will). So I wouldnt go as far as to say that the X1900 series is overkill for RTS games...especially (not saying that the OP is) if someone has the same lvl of expectations I have for gameplay settings and speeds! So to the OP...just get the absolute best card that you can possibly afford in your system! Hope this help!
Best,
3Ball