1) No point buying 7300GT DDR2 for that price, you can get it around 4.5k or so. search at techenclave.com.
2)For around 7k you get Leadtek 7600GS, rather spend 1000 bucks more to get that.
512mb, ram might be availalbe around 1800-1900 also, maybe even cheaper, 1gb can exceed 4500 as well.
you are talking of ddr 400 modules only, atleast i am.