I'm not a manga artist but I had to pick this up. $15.00 for the pro version.
http://www.clipstudio.net/en/functions
You can mix vector line art and raster colour layers in the same document, use in-built poseable 3d mannikins as figure ref, there's a host of tools similar to Lazy Nezumi Pro (which I wouldn't be without) and a whole lot more. You can export to PSD and back too, and there are Letratones!
I see me using this for quick concepting at first until I get used to the tool-set but for 15 bucks, it's a no-brainer purchase for me.
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https://www.youtube.com/watch?v=6NjZ4OH6Gjc[/ame]
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Also just wanted to clear up the fact that the "pro" version on sale here is just the regular version of the app, while the advanced versions of both MS and CSP are labelled "EX" ... if I understand correctly.
Speaking of painting, while 200 brushes is way overkill...
http://frenden.myshopify.com/products/manga-studio-5-brush-super-set
I can definitely recc this. I have two or three brushes from this set that I use daily over the included default brushsets, and it's well worth its money for that alone.