Card Need Need it to Play a Game and my Power Supply HEC 350 W AND My Screen CRT 17
Ouch. That kind of changes things.
You can probably run a 5670 on that power supply, but I wouldn't risk a 4770 or 4850. Or a 5770 for that matter. You're probably looking at another $40 for a reliable PSU that will run any of those.
So ... if you're absolutely stuck at $100 AND
you have power issues, then I guess the 5670 makes sense. It'll work fine at the lower monitor size. Not as well on the bigger monitor.
But if you're upgrading your monitor also ... that tells me you've got a way of getting more than $100 total for a video card. Seriously, if you're going to a bigger screen, this is not the time to be cheap about your video card and have it come back to bite you later. Wait a month or two if that's what it takes, and scrape together another $50 or so to get a 4850 and new PSU. Better still if you can get another $100 and the 5770.