The 5000mah Core LiPo's sold by Schumacher are really good too. It is a 2 5000mah cells (2S1P) so it flows current better than the Orion 4800 (2 2400mah cell packs in parrallel, 2s2P).
I have abused the heck out of a pack for a month and its doing great. A lot of people around here got them based on my recomendation and they are all really happy too.