Been through this process just recently, started with Python and got everything as I wanted it, bug power plant etc...
In a moment of boredom I sold the lot and got a FDL. Loved the sound of the engine
But after a couple of weeks I've gone back, just found the FDL wasn't big enough - couldn't kit it with enough stuff for serious combat without sacrificing almost all cargo capacity and exploring potential. I don't go anywhere with a basic discovery scanner and a fuel scoop.
So I'm back in the python, A6 shields, 4 A0 boosters, 4 SCB's, 2 big gimballed pulse lasers, a big gimballed cannon under the nose, and loving it. Did two RES sessions in Atam whatever it's called last night, 1.3million each time and used 1 SCB over the course of the night. Love it. NPC Anacondas fear me!
Back in there tonight without any fear.