What hppa is supported well by OpenBSD?

Hello,

I'm thinking about getting a hppa machine to play with, and I've got the
choice between these models:
 HP 735-125
 HP 730
 HP 715-100, 715-75, 715-64, 715-33

The list of supported hardware says they're all supported, except for
the 730 (which I thus won't be getting ;) ).

Can anyone give me some advice of which one of these is going to cause
me the least amount of headaches? I also read that some systems aren't
able to boot from disk yet, but couldn't find a list of which ones.

Thanks,

Sebastiaan

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