I'm not sure how to find the Watt capability.. very new to installing graphics cards, the card that caught my attention was PNY GeForce 9800 GT, but I'm also open to suggestions on cards that would be better around the same price margin.
Any related feedback/comments would be appreciated!
A 9800 is the best card available between about $80 and $105. You should be able to run it with about a 400w power supply--depending on the amperage etc.
When you are shopping notice that there are some 9800GTs that require a 6-pin connector and some that do not. Sometimes the "green" or "power saving" ones are clocked a little slower or something to make them less of a power burden. Both are good options.
1. Looking at your specs, I would say you could get away with an ATI 4670 ($60) on the current PSU but not anything much more powerful. The 4670 is a big step up from a 4350--but still wont let you max out settings on newer games.
3. If you decide that you want a powerful graphics card for gaming you will need to purchase a new power supply. The most reliable PSU brands are Corsair, Antec, and PC power and cooling(P&C is american made).