I know a company called hobbywing that makes cheap and reliable esc's, they sell a 180 amp brushless water cooled/proof boat esc called the Seaking-180A for around $115. Heres some of its basic specifications: <div><span style="font-family: Arial, Helvetica, sans-serif; color: rgb(102, 102, 102); line-height: 16px; -webkit-border-horizontal-spacing: 1px; -webkit-border-vertical-spacing: 1px; "><span style="color: rgb(85, 85, 85); font-family: Arial; ">Output: Continuous current 180A, burst current 360A.</span><div align="justify"><font face="Arial"><font color="#555555">Input: </font><font color="#555555">6-18 cells NiMH/NiCd or 2-6 cells LiPo. </font></font></div><div align="justify"><font face="Arial"><font color="#555555">BEC Output: </font><font color="#555555">5.8V@3A Switching mode built-in BEC.</font></font></div><div align="justify"><font face="Arial"><font color="#555555">Suitable Motor: Sensorless Brushless Motor</font></font></div><div align="justify"><font color="#555555" face="Arial"><div align="justify"><font color="#555555" face="Arial"><font color="#555555" face="Arial">External  diameter of the water cooling pipe: 5.0mm</font></font></div><div align="justify"><font color="#555555"><font face="Arial">Size: </font></font><font face="Arial"><font color="#555555">72mm(L) * 68mm(W) * 34mm(H).
Weight: 165</font><font color="#555555">g</font></font></div><div align="justify"><font face="Arial"><font color="#555555">They seam cheap but I have one and they work well for me, you can check them out at www.hobbywing.com but their only sold on ebay</font></font></div></font></div></span></div>