I love the Gemini as well. A dial was on sale on the forums for $500 or 600 not too long ago. Hard part would be getting the caseback, which is so cool on that model. The Omega parts connection would really help there!
A couple fully built Mitsukoshi mods went fairly cheap on the forums this week, it made me curse my birth year idea.
Tambowatches on ebay really puts together some interesting modded speedies. They have one modded with an original snoopy dial and caseback now for $7k. They always have Italian Albino dials, pandas, etc.
There are also the Olympic 2020 series now that brought back all of those color schemes. Personally I think that makes the Mitsu and Gemini a little less special, which is sad.
I went from zero speedies to now 3 in 6 months. I wanted one ever since getting into watches. Bought a sapphire for my first son's birth year, then a 40th anniversary Apollo 11 for way under market, and finally this incoming one. I think the problem is that I was so intensely following the market, that now I can spot the deals and have trouble passing them up.