Have 2 mates with evo X one has a fq360 lovely car. The other a GS300 currently being built by Matt & The racing line to 800bhp, Also driven a sst 330 Handle very well for a heavy car and I would say IMO the best Evo out the box for the overall package. much better than a 9.
If your going SST they only come in 300 & 330, there tunable but big £££ to do it.
Also it's recommended they have a rod job as some earlier 08 spec have this issue. once done plenty of scope for BIG BHP, Things to look out for weak chains as mentioned, Maf's tend to go, Upgraded Fuel pump relay, warped discs, gearbox fault's can be checked scrolling the screens on start up.
For the money I would go for a 360, Here 2 of my mates on Rota's
fq360
GS300