How about a big molten ball of rock guys?
I guess if ya'll are planning to stick around for the millenia it takes for it to cool, cool. You're not taking in to account how close Venus is to it's melting point anyway, without human intervention. It has a periodic "asthenosphere-lithosphere overturn" apparently from the crater record. Hit it with a comet, release more volatiles from the rocky body. It'd take forever and you'd be left with a planet you wouldn't want anyway.
Venus, the coal industry's poster planet. Lots of CO2, lots of heavy metals. What could be better Scott?