If I were you, a spd 300-400 with a 1.8:1 or up to a 2.5:1 gearbox and a 8x6 or 9x6 folding prop or a minimum direct drive motor of the size 480 is the way to go. I was flying the firebat before it was normaly available on US shores, the UK version called the Foxbat. It was having problems in the UK long before it got here. Although I am one of the first to get it to fly electrically with no crash on the first flight here in the US, it's marginal on direct drive other than a size 10 or 20 brushless, but those are fairly expensive. The 49.00 kit is the way to go, get a greaplanes C-20 esc and a gearbox for the motor or a direct 480. Tape the entire plane together first to get an idea of where everything will need to be placed. Replace the wood spars they give you with carbon rods, if you find hollow rods, piano wire that slides into the rod can be used to help with CG, I may try a steel rod in my next glow version. If weight needs to be added still, make use of mechanical advantage and place the weight as far forward as possible to ensure less weight. Then create a cavity in that same place and install the weight before you join the fuse halves, this hides the weight for a cleaner looking model. They claim there's no problem with the kit, yet they ask you to modify the airframe from how it was originally intended to be assembled by removing foam and maybe switching around servo's for battery placement. If and when you get yours flying they do fly awesome.
Good luck