Well, because the 635M doesn't work that well on TD right now i will have to buy another one
I found another laptop from ASUS (X73SV), cheaper and with lighter hardware:
Intel Core i5 2.4GHz (2-core)
6 GB RAM
NVIDIA GeForce GT 540M (1 GB DDR3 SDRAM)
17.3" LED Display 16:9 (1600 x 900 HD+)
I'm quite unsure about the i5 2.4GHz on this one, too slow? It's only 2-core. The graphics, well, 1 GB should be enough?