thef0x,
I definitely have a similar issue. Ideas are fun to play with, and they're "ideal" -- you never see the imperfections until you start trying to bring them into reality. And then it's all too easy to get distracted by newer and better ideas.
My (attempted) solution is to throw my hat over the fence. I've quit my job, with enough savings to get my small business up and running... as long as I stick with the plan and don't switch tracks halfway through. I've also picked a field that should give me the opportunity to explore new ideas
within it. And I'm trying to accept that my first attempts aren't going to be perfect in reality as they are in my head. Experimentation and failure is part of the creative process. Perfectionists like us want to skip that part, but we can't, not if we want our ideas to see the light of day.
Perfection doesn't exist.