Looking for a narrower tank

[Arsenix2001]

I have a 38 gallon with no sump and was toying with upgrading. Was eyeing out an aqueon 125 at petsmart with stand for 499 but the stand is garbage and I think when uograding I want a sump. My hob tank looks like a science experiment, at least the experiment is going well. My problem is I dont have alot of space for depth, 18-20" would be Ideal depth and would rather have length, (I want a yellow tang). I was looking at the red sea 350, which is 20" but only 47 long. Im open to gallon ranges from 75 minimum to 125. Any suggestions?

 

[Auquanut]

My 125 is 6' across and 18" front to back. I really like it (tangs do too) but if I had it to do over again, I would have gone with a deeper 220. I had to stack my rock work against the back glass to allow any open sand in front.