Definitely try the clears if you're going to try a Cherry MX switch. I have a feeling that blues might just be too loud for you, and the browns feel pretty close to linear for most people. Not to push it too far off topic, but also try the buckling spring keyboards. I find they are the best alternative to the Topre switch, and the easiest to switch to after using the Topre, and vice versa. Obviously, your mileage may vary, but they definitely meet the last three points you mention. Size might be a bit of an issue though.
Honestly, I do not believe the Cherry MX switches, of any variety, compares favorably to the Topre switch. Maybe it's just me, but I just don't like the way they feel, at all. I've used all of the "current" variants, other than red (clear, brown, blue, black), and while some here compare the linear switches to the Topres, they just don't feel right to me, at all. BS and Topre, all the way. The only keyboards worth typing on.
Oh, and if you can afford it, just get the HHKB. You'll never want to go back to the silly ANSI layout, ever again.