im currently setting up a reef tank, it has an over flow in the center with drilled holes,..it was a HUGE pain to set up..(im new to plumbing) ...word of advice, go to a pool shop for your parts. but drilled does seem to be looking like a good investment,...if your looking to buy a tank i would personally get an acylic tank if i were you, what i did...i have mine full...and the rounded corners look amazing, everyone that comes over says how much better it looks then a standard glass tank...plus its more clear then glass.
just my 2 cents.
~chris