I've been scouring RC and some other sites for the last few weeks, trying to figure out what kit to get as well. Based on price and performance, I think I'm going to go with the RapidLED setup as well. Mine will be mostly for growing acros, but I have the 29g biocube. I just have to figure out whether a retro will actually be better than these Ecoxotic panorama pros that came with my tank or not.
14g acros are doable, but I imagine it'll be tough unless you're planning on lots of frequent water changes