Hi Austin,
The basement heating system that really impressed me was this one..
Low Profile Solar Hot Air Project 1
I loved the low-profile system and it does get some heat down into a finished basement.
I think the visual impact, price and performance is pretty dang good..
You just need some outdoor wall space facing the south.
We have a forced hotwater baseboard downstairs now. Uses too much oil to run.
Recently, I was thinking of adding some one of those radian floor setups to the finished side basement floor,
But,
not for radian heating, but to scavenge the 60F slab heat. It's free geothermal heat!
I would cover it over, with an insulated floor. I know that sucking all the heat out of the slab would be pretty quick,
but I think it might recover in a few hours.
It might be good for getting a bust of heat, while I was down there working.
And it might warm back up to 60 overnight..
I have an old 18,000 BTU AC that I'm about to un-install..
It's in good shape, and might be recyclable..
Cheers,
Rich