I have all my quince in pots. Brent believes that they grow just as quickly in pots as they do in the ground:
http://www.evergreengardenworks.com/quince.htm
I haven't really styled mine at all, as they are recent cuttings and I figured it was more important for them to get established and put on a little bulk first. I would say that the toyo nishiki variety seems to be the most vigorous, and puts on length and bulk a lot quicker than the others I have. I even cut off a sucker with a small amount of roots and potted it up, and it has been really taking off.
One cool thing was to see one of my toyo nishikis put out fruit last year. I reduced the number of fruits to two, and they got to about the size of a raquetball before I cut them off. Unlike the flowering, which doesn't seem to sap the strength of the quince all that much, the fruiting definitely slowed growth on the toyo nishiki to a slow crawl. Wasn't unexpected, but in the future, I'll probably make sure my quince don't fruit.
I have the International Bonsai magazine from last year. I also have The Art of Flowering Bonsai from Peter Adams which is pretty informative.
Nice quince JKL