Fully fleshed and well-justified ideas worth hell of a lot.
Investors don't give people money for plans and research because they don't mean anything. It's easy to make a plan or find a hypothetical market.
The only people who get money without customers are founders with huge exits on their resume already.
Especially the last one.
There are certainly things that I suspect there would be a huge market for. That, I suppose, is my "good ideas" list (or, because I'm not an oracle, my "wish list").
the idea can already be there, already implemented and even already successful
and an incredible execution can just take over
you don't take over on ideas, you do take over on implementation
few examples: hotmail and then boom gmail took over, IE6 and boom Firefox took over, etc.
in fact implementation is so much more important that you have to keep doing it right otherwise someone else take over
also you can not keep an idea secret forever, once you release your product, everyone know about it and get a shot at their own implementation of your idea
"Fully fleshed and well-justified ideas" are worth 100% of $0.
Execution is everything. How you implement and execute the idea is what sets you apart.
the very same idea could be implemented in different ways, some would work, some other would fail
the only way to be sure is to build it and ship it, eg. "does my implementation provide value to customers or not?"
it does not have to be big, it does not have to be perfect, it does not have to be complete (avoid the features creep), but the implementation itself or the product is what determine the value or potential value
other people like co-founder, talents, etc. are basically people who will see the value but think "hey I can build that better", "I can sell that better", etc. and decide to join you in the process
so yeah pretty much "Start building and start selling"
for the founding part it will be either you have the skills (tech, marketing, whatever) and so invest your time, or miss some of those skills and use your own money to cover those parts
I do not believe you can rely solely on "strong ideas"