RW-
Yeah, I probably can't PM either as I just registered here yesterday. No worries.
There are a few affordable options at Manassas. The most affordable aircraft available there for rent is a C152 (actually IFR certified w/ dual VORs) at $80/hr wet. I should mention that I think this is the least expensive aircraft for rent within roughly 1 million miles of DC.
There are also a number of C172s for about $120, an Arrow at $130, and a DA-20 for $120. To my mind, those are all good prices for this neighborhood.
I was leaning towards the C152, simply because it is not important how fast I get to CHO or SHD, but rather that I get there affordably in a reliable aircraft. That said, I could be convinced to do it another way.