Yup... Your 350 watt supply will do fine if you're not running a bunch of drives and stuff. I went with a 500W set-up because I have loads of fans, drives, etc... Also, CPU temp is highly dependent on ambient air temperature in the room. Even with the water cooling system this is true. I mostly keep things cool running the A/C, so it's usually around 72ish in here. Right now I'm running at 85F/29C on the digital temp readout! Under full gaming load it'll still stay around 32C though, and that's overclocked almost 600 Mhz.
Cyberstang is right, you can't beat a Trinitron 21"! That's what I have also. I run at 1792 x 1344 resolution, which allows me to run multiple windows and size them so I can see everything all at once without switching between windows. Or, see an entire document all at once without scrolling pages, etc... I run my browser, email, IM (Trillian), and TV window all at once and they are laid out so I can see everything at once with room to spare.
But, the nicest thing is when you do development work because it allows you to have a lot more code without wrapping or going off the side of the screen. Or, in Photoshop you have a lot more room to work with and see a whole web site layout at once (and even zoom in once and still see it all on one screen).