I'm a subtle saturation junkie. I've got the Thermionic Culture Vulture, it's better for individual instruments, IMHO. I've got about 10 other things as well, ranging from subtle to dry butt extreme.
Here are 2 things that I personally recommend for 2 bus. One of them is rather cheap and is a secret weapon for getting a loud, dynamic mix.
CDSoundMaster Source +
CDSoundMaster.com
Get the matched Mullard upgrade for $110. Total cost is $610 + Shipping.
There's a natural limiting, compression that occurs with the tubes that adds a nice thick punch. The signal path is designed for mastering and lacks the noise found on the Culture Vulture.
The other is the Atlas Pro Juggernaut Twin. I just got mine Friday, but early results are right up my alley.
APA - Juggernaut Twin NOW SHIPPING!, Juggernaut 500 series, Revolver, Blank Panels - Call Us US Toll Free @ 1.866.235.0953, Ph. 813.746.4058
Nickle, Iron Transformers. Switchable on the Input and Output.
Hope this helps.