http://www.glasscages.com/?sAction=ViewCat&lCatID=2
Hey, check these out, & I'm sure that they will place your overflow anywhere you want them, so will AGA for an extra fee, I know this because I could of ordered my 59g Oceanic with extra holes about $20 extra.
On a side note, tanks normally don't hold value once used, I wouldn't let that hinder my design but again If it was glass I wouldn't have a million holes in it either. You can have your holes on each end as the come with the twin overflow but skip the overflows, just the holes. You can then go to the glass shop & have them cut & sand the pieces you need to make a coast to coast & you then can silicone it together like all glass tanks already are, not much work on your part & you can get it the way you want. I have seen where people made overflow with no fingers, just smooth across the top., really I don't think that would be as much of a problem as the suction I have on the intake on my CL, I had a few losses that got sucked to the box I made until I tweaked it some. We have a thread here that a guy built his own glass tank, you can skip that part, save money on the overflow part but keep the holes & he also built a overflow out of glass. I'll find it!
http://www.reeffrontiers.com/forums/showthread.php?t=11337&page=3
Ok I thought I had a coast to coast out of glass but can't find that one.
I would get prices from your LFS & ask about prices on just a reef tank no extras & no overflows unless you want them to make one with two, which I think would be fine. You have options If your LFS is willing to call & get prices, which is way cheaper than getting package deals.