You can get an SRT-8 for under $50k... you won't be able to get a CTS-V for under $65k. In fact, I've seen brand new SRT-8s on the lot for $42k.
If you can afford a $65k car, go for it. I just don't think I could justify the extra cost over what you can get with a loaded SRT-8.
Just from a pure "numbers" standpoint....going with Starting Prices:
For the CTS-V, you're paying $116.03 per Horsepower (556 HP, $64,515 Starting Price)
For the SRT-8, you're paying $98.91 per Horsepower (465 HP, $45,995 Starting Price)
For the Superbee, you're paying $92.46 per Horsepower (465 HP, $42,995)
For Weight the CTS-V is 4255, the SRT is 4365, and the SuperBee is 3961*
*I got that weight from Car&Driver's website...seems a little low to me, for some reason I thought the Superbee weighed in around 4150.
That gives the "Bang For The Buck" edge to Dodge