Tom, if you love both Tk's and Sandtroopers, then you'll want to do a Heavy Weapons Trooper because it is based on a stormtrooper but with accessories of a Sandtrooper.
There are actually a lot of small differences between a TK and a TD: http://www.looksirdroids.com/replica_sand-storm.htm
Here is a Heavy Weapons trooper, based on the Battlefronts game:
http://www.whitearmor.net/forum/topic/27258-my-hwt-submission-pics-for-basic-heave-pics/