Hello, and welcome to TRT!!
Reef ready (RR) tanks are tanks that already have the overflows so you dont have to do any drilling. If you're not experienced with drilling glass tanks then I recommend going with RR.
What size are you looking for? 4' or the 3' length?
The wider (front to back) your tank is the more unique aquascaping you can pull off.
I won't get too deep into everything right now, ask all the questions you need, we are all glad to help.
Some things to consider:
fish, inverts, corals (lps, sps, softies)
ligthing MH, PC, VHO
skimmer, water movement, fuge, sump, etc.