Ok, this should work in any modern DAW, but I can't be sure, so if you have trouble please post, too!
• First, don't put any processing plugs on the master buss. You can put analysis plugs, like spectrum analyzers, meters, headphone-monitor-emulation plugs, etc. But nothing that will affect your final mix like a compressor.
• Next, create a group buss called 'MixBuss.' All of your mix tracks, groups, sends, auxes, should all be set with this group/buss as the output (except those going to a group first, but that group then goes to this buss.) You can put your master buss processing plugs on this buss, such as compression, saturation, etc. The output of this buss is your mix, with all the processing, etc.
•Now, create a few new stereo tracks to import your reference songs. I'd name them based on what you're referencing in that track, like 'Drum Ref,' 'Voc Ref' etc. These all have the master buss as their output, so they don't go through any of your MixBuss processing. Mute these tracks.
• With this setup, when you play back your mix, you can hit 'solo' on any of the reference tracks and instantly hear them for comparison. Since your 'MixBuss' channel is your finished mix, you can tweak the output, add a limiter, etc, and hear apples-to-apples your mix against the others, as well as see how they look on the spectrum analyzer, etc. This also allows you to use the headphone mixing plugs or room correction plugs/eq, and hear the references the same way you're hearing your mix. And you can go back and immediately tweak your mix, while the sound of the reference is fresh in your mind.
• When you're happy with your mix, bypass the effects and eq on the master buss, and export away. You can take the limiter off the 'MixBuss' as well, for the mastering engineer.
I hope this isn't confusing, and I imagine some are doing something like this already. Try it out, and let me know what you think! Be careful not to copy the reference mixes too apishly, though, as can be easy to do!
(I got the inspiration for this method from Mike Senior's book, but wanted to reference without having to export, etc.)