Finally gave Manga Studio a try! A very lightweight but powerful drawing software. It didn’t lag at all despite working on a high resolution image! And the working file itself is very small, compared to regular PSD files.
I used it just for inking. The colors are done in Photoshop CS3.
A 15-page illustration book I did for one of my course. I’d say it’s pretty good, quite satisfied with the result, though it didn’t turn out as how I imagined it to be (partly due to bad time management; it was pretty rush).
The conceptualizing took me around 2-3 weeks (non-intensive), lineart for all 15 pages took me around a week, colouring (Photoshop) took another week or so.