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Ahh...silly question, but why did you delete your heater? Core go and not worth replacing?
Computer fans are probably cheapest...probably the bigger, the better. You just need to make sure your solar panel puts out enough watts to run it. Not sure if you need to worry about too much power/voltage (a 12v solar panel will tend to put out 18v+ full sun, no load), but I would say more is better...you can always make a small dump load...like your car's battery. A simple diode could do that.
I'd start by finding out how many watts I need and probably look for a 12v panel that's rated at twice that, so it will hopefully work in low-light.
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