I'm adapting to the Melda offerings. Definitely impressive and deep capabilities in them, and quite often with very little effort you can get a "wow" moment with the sound. Their price, especially if you catch a sale item, is really reasonable.
All that said, I love the FabFilter stuff. Their interfaces just invite you to work with the tools and like Bit says, Pro-C is just great. Pro-Q as well, and on and on.
If I didn't have any of that stuff and only some spare change in my drawer, I'd first go for Melda offerings. The end result is you actually get probably the best results with them anyway in terms of sound. But they aren't pretty tools. It takes a little patience to understand how much power is at your disposal with them.
FabFilter stuff can be a mix of tough and easy as well to learn, also have great results, and sure are fun to look at and adjust. But unless you get in on a rare sale, they definitely are pricey!
Yorolpal has rubbed off on me, and I agree and vouch for FabFilter.