Ooohh I love me some mechanicals. Cherry MX Clears are my favorite switch by far - great weight and feel, without the noise that blues/greens can cause (though O-rings help). Browns are the same as clears but a bit lighter (take less force to activate, and don't have the click of blues/greens), and are also a good choice. I've gone through quite a few boards determining what I liked best. From my experience :
Filco Majestouch 2 - 104key w/ Browns. Great board, great build quality. Stock keycaps were awful, but that's par for the course. Loved this board, but other keyboards revealed how much I prefer a smaller form factor like 84key (tenkeyless) or 60%. Couldn't bare to get rid of it, and since my mother enjoyed using it, it stayed with her.
CM Novatouch - 84key w/ Topre switches. Topres are a bit of a different animal, as far as how they function which is much more similar to a standard rubber dome board compared to a mechanical switch. Regardless, they're very nice and very expensive. The Novatouch was nice, but given the price and my preference for a heavier switch (Topre's are typically very light except for certain Realforce boards) this one ended up on Ebay.
WASD CODE - 104key AND 84key w/ Clears. Yep, I've owned one of these in both tenkey and tenkeyless form factors. The 104key came as I was discovering my preference for smaller boards, so it ended up being sold and replaced with a tenkeyless version that is now my work keyboard.
HHKB2 (Happy Hacking Keyboard) w/ Topre switches. Great board with solid build quality - very small and light, and very expensive with limited availability. Great stock keycaps, which is good since there are very limited options for Topre keycaps. Doesn't see daily use, but is often the board I use with my laptop.
Leopold FC660M w/ Clears. Ugh. My lost love. Great (and unique) layout that is essentially a 60key + arrow keys and Insert/Delete. Loved this board enough to buy a nice aluminum case for it, just for it to die on me only 1 week past the 1 year warranty expiration date (granted I had voided the warranty anyway with the case, but still). I plan on dissecting it soon enough and trying to fix what I believe to be the issue, but just haven't done so yet. My favorite board for the year that it worked.
POKER 3 w/ Clears. Very nice board with a lot of features and great build quality. The layout took some getting used to (especially hitting FN + JKLI for the arrow keys) but now that I'm acclimated I really enjoy it. 60% layout, so it's very small. Came with some pretty decent PBT caps, which is a plus, along with an aluminum case.
In addition, I have a Custom Winterfox board on order from a Massdrop drop in late December. Should be here in about a Month, so I'm excited for that!
Pretty solid list of boards now that I look back at it. Certainly a cheaper hobby than the audio equipment I've more recently gotten in to, though the kb "collection" is a pretty reasonable size now that I know what I like. The growing headphone collection will hopefully follow suit!