The Hacker inrunner C50 13 XL competition and the C50 14 XL series are really great motors and very powerfull. The only thing you have to do is to re grase the gear box every 50 flights (manufacturer recomendation) it is no difficult but a little boring to do. There are a couple of threads abouy tis motors were you can get the information you want in maintenance. Another option is the NEU F3A inrunner Motor. Chip Hyde, Todd Blosse and other pilots uses then and are really happy with the overall performance and not less important is that cost almost half price of the Hackers.
http://www.rcuniverse.com/forum/m_9477756/tm.htm (New outrunner F3A motors from Hacker)
http://www.rcuniverse.com/forum/m_8978321/tm.htm (Hacker maintenance)
http://www.rcuniverse.com/forum/m_8385022/tm.htm (Plettenberg Xtra 30-10 Evo outrunner motor another great option)
http://www.rcuniverse.com/forum/m_8576514/tm.htm (AXI outrunner)
http://www.rcuniverse.com/forum/m_3540820/tm.htm (another AXI)
http://www.rcuniverse.com/forum/m_8265465/tm.htm (NEU F3A motor)
I think you will get the info you need, you should check the whole electric forum.
Hope this help.