I agree the pre-drilled may be a bit harder to find but..it seems to me that there are always people giving up on the hobby at all levels. For me I found exactly what i was looking for..it may take a while to find exactly what your looking for, but from your post..your not in a hurry. Check out the classified on this forum (thats were my 90gal came from) and check out E-Bay under "Aquariums" theres usually about 20 pages of Aquarium auctions. Just check them out for a month or so to get a good idea what the market is like and eventually your going to find exactly what your looking for. I think its crazy to pay full retail when theres deals that will include tank and all the equipment. Sometimes you get the liverock and all the fish too!
Here's an example that isn't that far from you:
One bit of advice though, try to find newer tanks and equipment i.e: 1 year old...obviously a better deal.
Oh, and hopefully you don't interpet this post as me trying to tell you what to do..I'm just trying to help..you could save hundreds if not a thousand or more