Welcome back Dave, nice to see you're still OK.
Seeing you brings back memories of old Boomerang Rapido days, which then turned into dEmporium Racing (later stopped). A few of those drivers then formed multi-sim RSC Motorsports (also stopped, am I jinxed?)
Since found a nice family of friends with T7R
The G27 is an evolutionary improvement over the G25 (got one), but not worth it for the price differences you found between them.
If you're buying a new PC, I'd say nearly all are capable of running LFS, you just need to invest a bit more if you're planning on super resolution. You might consider triple monitors, which LFS is about to support in next official patch.