well the optimum for me would be 36x24x18.....Once upgraded its a tad expensive and would require a custom stand..
http://www.glasscages.com/?sAction=OrderForm&sProdID=AQ_65Wide
add starfire, overflow, acrylic overflow,black silicone, custom stand, shipping and I could have bought a 120 tech tank
it would also pose the problem of having a center brace requiring me to use 2 halide bulbs..........
All glass aka aqueon sells the 50g size also, problem is it has a center brace.....Sure i could cut it but I forsee a wavebox down the line......
Maybe I'll get lucky and Liam custom tanks inc. will build one for me for a fee