3200>7600 when it comes to graphical quality, however the 7600 may be slightly faster for clockspeed, it is however a much older process. The 7600 is most likley not HTCP compliant (so no high def anything). Assuming this is dealing with the 3200 being an onboard GFX solution, as opposed to the 7600 being a card. I'd recommend getting something like the 4570, or even the 4350 instead, as they will destroy both of the ones you listed (for little cash).
Well actually I take that back, the 3200 is a little slower than the 3450. Basically the core speed is 500 while the 3450 is 600. Same number of stream, texture, and rendering units. Anyway, yeah the onboard graphics is going to be a little faster than that 7600GS in some cases.