I would have said the SM300's as well, but since you don't like them, perhaps a Speedmaster Professional? There's a bajillion interchangeable parts, as well as a decent supply (for now, at least) of bits available? Watch this space for my latest project (coming soon)
Aside from the SM300, have you considered the SM200 (SHOM)? I think these are pretty cool:
I've seen them on lots of different straps too - rubber, deployment, shark mesh...
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