I know some folks don't put a ton on their 2-bus and others put everything and the kitchen sink on it. For my business I try to keep as many dollars in house as possible and mastering is often left in house. I get to work with an excellent mastering engineer a few times a year and I love it. I run my 2-bus way differently when I am sending him a mix. When I am doing the mastering as well as mixing I have a waves maxxbcl hardware using the limiter section only at the end of the chain. I pull about 1.5 db of the peaks off as I mix. Before my waves hardware unit I have a manley variabl-mu. This compressor has not left by 2-bus in 5 years. I had a super tough acoustic session to mix, which is odd, because I usually feel I excel at these type of recordings but as I was mixing I was getting this odd bump at 200hz and the 2.5k ish territory. As I would go into the individual tracks it could get some improvement and when I would eq my 2-bus with a plugin before or after my chain it was also of little use. In a fit of desperation I put a live 31 graphic eq between my Manley and waves maxxbcl. It was just the ticket. The placement is the key more then the eq unit itself is what I am thinking. In the mean time I have 2 550b's on the way to replace my little graphic because I haven't taken it off since the project and it has become an indispensable part of my mixing. If I love these on 2-bus but find them not adjustable enough I'll use them on tracks and get a 5500. I already have 550b's and love these eq's. If I am not crazy about them it looks as though I'll need to break down and get the massive passive I've been pining for since I loaned it a few years ago. What are you guys using on your 2-bus?