Which PC to buy?

do yourself a favor and goto ibuypower.com
at least you get a decent vid card

or even better newegg/tigerdirect/ebay and BUILD

you still havent told us whether or not you'd be willing to build your own

go to global.ebay.com ;P
and id replace the pc with a good mac :P
still aint got that much money :))

I think to work in autocad the best option would be the first

You want a cheap video card? I'm selling my old 7900 GTO on eBay... :P