Proper Corsets (waist training)?

This is for proper corsets, eg. steel busks and spiral stays and whatnot... Please don't tell me to go to hottopic.

I'm really looking at buying an underbust corset pretty soon.

I've pretty much fallen in love with this one:

http://www.fairygothmother.co.uk/newimages2/tr-01b...

But its long-line, and I'm not sure if that would limit its wearabilty or restrict movement or w/e...

They are expensive, I shan't be affording another too soon. And I'd be wearing it often, so I wouldn't want anything thats too impractical.

Basically, I'd like some help!

Or suggestions of more suitable styles etc.

Along with maintenance tips

And some suggestions of online shops, that ship worldwide (though I'm probably going to go to a shop I know for the first one)

Thanks x