Red sea is very high quality, and almost plug and play. If I wanted a tank in their larger-size area (the new XL and XXLs) I would go with a RedSea setup. I helped my friend set up his ~90g Red Sea 350 and it's a very very nice setup that he has done a great job with and enjoys very much.
If you're starting new in the hobby, a turnkey setup could be a 32g LED biocube. I saw a mostly stock one recently that was very impressive in the nano forum. If you're at all handy, or interested in technical stuff, I'd recommend just starting with a 40 gallon breeder, 55g, or 90g tank and building up from there, including getting the tank drilled and running a sump (at least for a 55g or 90g; the 40g you can get good hang-over-back equipment).