The VI are all 280 bhp from the factory
Very easy to get and run a reliable 340
Hidden chassis rust is now becoming an issue ( see MLR threads on rust)
AYC fluid needs changed every 4500'miles (<£100)
They are pretty robust
Look out for Ayc pump, noisy transfer box, disks and clutch are expensive compared to a Cossie.
Rs/Rs2 models much better on track as they do away with Ayc and have lsd's and stronger diff handle much better. Rs2 has benefit of Gsr refinements with Rs handling.

TME ( tommi mak)' is a GSR ltd edition with a few small tweaks looks good but just drives much like a GSR. Having said that most evo have been modified in some way so it will just come down to the spec of what you are buying.

UK importer did a ltd edition based on Rs2 called extreme which was rare and quick.

I preferred the Rs models great fun on a track.