Thought I would share an update on this thread after upgrading my TS ST to a 450 this year.
I ended up buying a 2012.5 SX-F 450 and am extremely happy with the setup. I ended up buying this bike based on 3 criteria: electric start, EFI, and budget. After buying the bike, I immediately bolted on some nice-to-have accessories including Cyclops light, AME heated grips, Thermo-Bob, header pipe heat wrap, and Li-Ion battery pack.
These have all worked great; however, it's become quite apparent that the stock race bike stator isn't ideal for running both a light and heated grips. I will be upgrading the stator to a beefier Trail Tech 75W stator this week which should resolve the battery drain issue. Only other upgrade I've had to do was to get some real bark busters. The OEM KTM hand guards simply aren't strong enough for snow play.
All in all, I'm extremely happy with the new setup. Appreciate everyone's feedback and opinions as I was trying to figure this all out.