I've been very happy with the quality of SR Batteries kits. For slow gentle flights check out the "Cutie" a nice thing about this kit is you cna upgrade the power system as well as build an altenate wing (Acro-pro) to give you a more varied and aggressive flight. I found that I enjoyed building the kits so much I eventually purchased and built the X250 which uses the same power system as the Cutie. These kits are not over powered by any means but you will find the detail of the instructions and the quality of the kits second to none..
http://www.srbatteries.com/kits.htm