Both my tanks are drilled and I love them, great flow and no worries. When you buy a tank make sure its not tempered glass or buy one already drilled. Most local glass dealers will drill the tanks, shop around for a good price. Buy bulkheads on line for around $6.
Using a drilled tank IMO
gives a nice clean look. You can go with 1 or 2 holes depending on what your trying to do. On my 55 fowlr
I have 1 return goiing into the sump and the other to my 20 fuge next to the 55.
Why no use the tak you have now??