new tank advice

[kgb]

hey guys i currently have a 20 gallon tank with a skilter and 2 power heads that pump 197/h gal each.i also have it running un a 175 watt 10k metal halide.i want to start a new tank and am looking for some advice and second hand parts. i was think of either a 50 gal or a 33 gal tank and using my 20 gal i have now as a refugium.(or maybe a 33 gal refigium on a 50 gal tank). i want to have it mostly a sps tank with a few softies and zoo's and some lps and clams. i waswondering what would be the best lighting would be( would i have to use new lighting or could iintagrate my 175 watt metal hailde). the reason i am asking you guys is you possible could help me and gie me avice on cheap alternatives. btw i am poor
what i have sofar other that what is mention above is (or soon ) is 2 and a half bags of sand from johanthon..... thats bout it.
i have a 90 gallong tan kbut i dont see me affording this as a new tank so i have chosen to go smaller . after seeing ajs 50 gal i think i light the 50 gal idea the best

but yeah any advice or help from you is very appreciated
and i know my spelling is horrible so sorry bout that