i was originally going to suggest this one...
Acer Aspire TimelineX 5830T-6486 w/ Core i5-2450M, 8GB, 500GB, DVD+/-RW, 15.6in HD, Win 7 Home Premium 64-bit at Memory Express
but after reading through, it seems the model before (4830tg-6576 which is what i have) seems like it might fit your needs more.
but i think you'd have to buy one second hand or something =\
mind you, i don't know much about these things anymore so i may not be of any help