well, I'm no expert and haven't driven the other cars, but I do drive an X11-08 Predatoir with all team-mods and that car is VERY nice to drive.
I'm still learning, crash quite regulary but have onlyonce broke a part during competition, after racing 2 years now (first with the X10 and now the X11).
Only once had severe diff-problems, (EIR '09) but once the problem was diagnosed (thx to teamdriver Nathan Ralls) never hd diff-probs again.
The team-drivers have developped a standard setup that really goes fab everywhere and only needs minor tweaks.
Parts are no problem as I order them all from the UK and have them within the week. So shouldn't be a problem for a UK-driver i think.
It is however more expensive as a B44, that's true.
But ... it's such a nice-looking and exceptional car