ckpash88 - Blichmann kettles. I now have a 20 gal. Hot Liq Tank, 15 gal. Mashtun, and 20 gal. boil kettle. While I enjoyed the coolers for a awhile (I started out with a 5 gal. cooler setup, then moved to 10 gal cooler setup), I decided I wanted to have a little more room in my mashtun and do double batches when I have other brewers over for a brew session.
The coolers helped get me hooked on homebrewing.. enough to want to take my brewing experience further.