You mean waiting for the new nVidia GTX460/480s so that the current card prices drop. You don't need these hefty cards pumping 200 GB/s of memory bandwidth and 500 SPs running a DX8 game. It is pointless. For LFS, you can just go for a used 8800 GTS performance level card such as a 9600GT, 8800GS, 3870, 4670, 4830, 4770. Running a GTX260 just for LFS is pointless. You are wasting your money better spent elsewhere; such as a better wheel, a bigger monitor as per needed.
GenesisX
EDIT: You can go for the newer 5670s which are really well suited for this. In addition, you can pump out video / audio through the HDMI port, and do all sorts of stuff. These well packed cards get the job done; you will be happy to get good HTPC capabilities with this sub $100 card.
No, a GTX260 is not needed.