I'm with WyrreJ. With all the mods you've really narrowed your potential buyer pool down to just a handful. Plus it brings into question the quality and execution of the mods. You know how well they're installed, but a potential buyer doesn't know that and will use that reasoning to lower your selling price. Think about it as a regular GA pilot who wants something a little different looking at a rarer production aircraft versus an already completed kit plane. Sure, the kit builder got his 40-hour signoff but how well is it really built? Production is a safer bet, especially for maintenance and if the buyer is thinking of having to sell it again as well. Perceived future value is better with stock.

Stock will get you the most money quick. Modded depends on the right buyer coming along, which could be while they're reading this post or next year.

I used to mod cars like crazy. But after being in the position you're in now I learned (the hard way) to never do anything that couldn't be easily put back original. When I do mods now, I try and maintain as stock an appearance as possible. If it's something that can't ever be changed you've got to be prepared up front to take the hit later on.