to upgrade or not to upgrade?

[sturner]

Hey everyone. I have been given an oppurtunity to upgrade from my current 29g semi-reef with Nova extreme T-5s(48x12x12) to a 55g (48x12x19?) anyway I won't be gaining any length or width, just depth. My current tank is tied in with a 29g tall and 10g sump/fuge so I'm running a 68g system. If I upgrage I will jump to a 94g system. I need your opinions. If you had this oppurtunity or if you have upgraded in the past would you do it? Why or why not? Also I know I've read somewhere before, but have forgotten, What's the going rate per gallon of a used tank?
Current total livestock
2 percs
4 chromis
1 royal gramma
1 LMB
1 blue/pink spotted goby
1 blue velvet damsel
1 yellow tail damsel
hermits
snails
emerald crabs
sally lightfoot

 

[sturner]

come on guys - surely you have some input on this. I'm just looking a good pro/con list to help me decide.

 

[shark bait]

I like big tanks, better balance in the water i'd always say go bigger.

 

[nycbob]

if ur just kepping fish, more depth is fine. if corals, get a better light or put less light demanding coral near the bottom.