I use the Beautiful Bends M4 from Daz. Not cheap, when it's not on sale, and full of magnets and deformers and a billion morphs. So it's also not a small CR2. But is the best set of comprehensive fixes I've found for M4.

After that, there's Ironman13's overhaul for M4. I actually don't use it much because mostly the BB figure takes care of most of the issues (and its magnets help fit the clothes to the morphs). But it's nice to have this option.

http://www.renderosity.com/mod/bcs/i13-overhaul-m4-edition/94600/

(There's a V4 version as well)

Plus a couple of fixes that I find useful for M4

http://www.renderosity.com/mod/bcs/i13-real-belly-m4/91180/ 

(There's glute squish morph set for sitting and leaning poses for M4, too. And a wider range of similar fixes for V4).

If you want to go a different route, and use the morph brush to fix joints -- but don't have a clue where to start -- this tutorial isn't a bad option. But there may also be some free tuts out there you can learn from.

http://www.renderosity.com/mod/bcs/smooth-pose-tut/89823/

And, of course, there's Xameva's Perfect series for V4, the complete set of which I think is or will be on sale shortly. (They come widely recommended, and I use them almost all the time.)

For V3 and M3, alas, nothing I know of, since Corvas's fixes aren't available. The morph brush is probably your best friend here, and really if you learn to use it, it's very cool. Frustrating as hell at first, but better as you practice. But I'd upgrade to Poser 2014, if you want a better morph brush. The improvements are incredibly useful (including a tighten and loosen fit brush that is collision sensitive -- for fixing even major pokethru in a matter of seconds).

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PoserPro 2014, PS CS5.5 Ext, Nikon D300. Win 8, i7-4770 @ 3.4 GHz, AMD Radeon 8570, 12 GB RAM.