We're trying to break sneak into 3 categories with a pick 2 out of 3 kinda thing:
Mobility - Being able to move
Safety - Being able to maintain range / first strike advantage
Combat - Being able to carry effective weapons
Mobility + Safety = Mobile Sentry / Sneak Snipers
Safety + Combat = DSR Sneaks
Mobility + Combat = Closer Combat Sneak
Clearly, combat is too combat, and DSR sneak is on weight watchers program but some tweaks here and there and it'll be ok, one day.