NetBSD-5, snapshot or head?

[luca%lavabit.com@localhost]

Dear list,

The NetBSD 5.1 release is 1 year old. What iso do you
advise to install for a new system, NetBSD-5,
daily snapshot or head?

Do you have any experiences in terms of "usability"
following the NetBSD-head for i386?

I'd planning to install it on an old laptop for
desktop and some development (Python).
I'm much more interested on features
instead of stability (I can tolerate some issue).

Do the new features in head are often back ported
to NetBSD-5-1? Or again, do the head is stable enough
for daily use?

Thank you.

All the best,
Luca.