Optima yellow top YTR 27 J Battery gets my vote. Loads of grunt and spins my motor like a top even with a supercharger fitted. Rated at 41 amps cranking and 66 reserve.
I'm another with a PC100 Odyssey, does the job well. Lithium battery technology is moving on, more and more Caterhams are fitting them - a massive weight saving, maybe in a few years they will crank a 7l V8 for road use.