Since you didn't specify budget.... This would be the ultimate setup IMO:
Neu 1515/2.5D Motor
http://www.rc-monster.com/proddetail...5_2.5dF&cat=20
MGM 224/18 ESC
http://www.rc-monster.com/proddetail...22418CP&cat=21
6s 5000mah Flightpower Lipo
http://www.rc-monster.com/proddetail...6s22.2voltlipo
That would be a wicked powerful setup that would make you forget your slow messy loud nitro forever.