Welcome aboard welshy
My lad drives the 2wd sworkz too. The local lads Andy, Chris, Mark, Gav and Lee are all doing really well with it too
Im still driving the b5m, we started on 210's last year, its a bit old and parts arent readily available ( as in you can get them but may need to wait or import them ) plus they are quite rare trackside whereas if you went for a b5m theres lots about lots of parts readily available and easy to set up.
There are as mentioned lots of really good new cars too like the kf2, xb2, yz2, team c evo/tm2 - best bet is to get down to your local track, see whats popular, if you can try have a drive if theyll let you