I'll agree with the Bit Man that the Mixing Bundle is a good deal at this price, as long as you find at least 4 or 5 of the plugins useful. I bought it a couple years ago (during a sale) and while I don't use everything, I think MDynamicEQ, MAutoAlign, MMultiAnalyzer, MMultiBandSaturator, and MDynamics make the bundle worthwhile. I also like the new MTransient plug, which has just been added (so I got it for free ... woo hoo!).
It's a good idea to demo some of the plugs first, so that you know you're comfortable with the GUIs and the way the controls work. Also, the CPU hit can be pretty intense, and there have been stability issues reported, so it's best to give them a good stress test on your system before plunking down the cash. Have fun!
Cheers,
Eddie