Would this graphics card setup be worthwhile?

currently using an ati xtx1950 series card with 512 ram, and 3Gb ram on the mobo, I run almost everything in 1920x1200 res. on windows xp.

now sometime in the next year I plan on buying myself a new machine and giving this one to my wife, however, there a some games coming out soon that I'd really like to play without dropping everything to low settings, so I'm looking around for some cheapo ways to get a little boost out of this system, the main option I'm thinking is installing another xtx1950 in crossfire, when I built this machine I made sure I had the option because it was getting popular at the time. so I know I have everything needed. but I'm getting a lot of mixed reviews about how good crossfire is, even on this site it kind of varies, some say its only worth it for a small selection of games, some say for the price it's not really worth it at all just buy a bigger vid card, some say it's always worth it for a high res display regardless of what games... so I figured I'd lay out my situation here and see what kind of suggestions I'd get.

Thanks ahead of time for the input.

-Makari