Looking for AfterMarket Heater/defroster

Not going with the factory heater in my Big block Duster but would like to have something for those cool evenings & fogged up windshield when it rains(Heaven forbid I should get caught in it)

Did a bunch of internet searches for what I'm looking for and keep coming up dry so I thought I would throw it out here.

But first the MUST & MUST NOT'S.....

1.)MUST be more compact than the factory heater.... DUH
2.)MUST have a way to hook up to defroster ducts
3.)MUST be electric....

4.)MUST NOT have a heater core with coolant!...see number 3.)

Lets hear about what you know about.:help: