How much different does a mechanical keyboard with switches feel than a buckling spring keyboard? I've never liked typing on a keyboard as much as I did my Model M.
Buckling springs are just a particularly noisy, high-force type of mechanical switch. Cherry MX Blues are basically a baby version of them.
I have the DAS Keyboard Professional (Cherry Blue switches) and I like it a lot, but it is still a fry cry from the feel of a buckling spring keyboard. The travel is not as smooth and the tactile response and noise aren't nearly as prominent.
I could only ever recommend a buckling spring keyboard to someone if they didn't have anyone else working/living with them, and if they didn't have to type an excessive amount.
Most people would be best suited with the Cherry Blue switches, and if you want a basic keyboard with those, the DAS Professional is great. The build quality is ridiculous.
Of course, it's got no media keys or 1337 GAMR bullshit.
The Thermaltake Mecha G1 or whatever was my second choice. It has Cherry Black switches.
http://usa.ttesports.com/products/product.aspx?s=18
I have noticed the double tap issue on my DAS Professional keyboard, but it's really just a matter of getting used to it. It's harder to tap, lift up past the activation point, tap again on these switches than it is with others, or with a shitty rubber dome keyboard. You can either get used to it, or just do a full double tap (tap, release all the way, tap again). Slightly slower, but I can't think of a game where that miniscule difference would ever matter.