Erik:
That looks like a very good unit. All plug and play, no soldering or anything, and FMA is a old and reputable company. Fred the owner is a modeler himself or used to be maybe doesnt have enough time now since his company has grown so much. I would go with a 1500ma lipo or even a 2200 if you can afford it and it will fit into you plane. I have learned in the last 4 seasons that I have used lipos that bigger is better, it doesnt put a strain on them if you have a reserve of output capability you dont work them as hard and they last longer. FMA used to have Kokam batteries but I heard they dont sell them anymore, dont know who they are tied into now. Best of luck on your project, Im sure it will be succesful with the power unit your looking at and thats a damm good price I think for a matched outfit, Let us know how it works out!!!!!!!!! BTW what plane are you converting??
Good Luck
Bob