Where to locate repos (on Linux)

I've been putting repos in various places, and I'd like to hear
if some of those places are more popular or more standard than
others. I can't figure out from FHS
(http://www.pathname.com/fhs/pub/fhs-2.3.html) what is most
appropriate, but I'd like to adhere to it if possible (not
creating some non-standard area). Here are some I've used, none
of which tickle me:

    /var/svn
    /var/<groupname>/svn
    /localdisk/svn
    /var/local/svn

I tend to use /var since it's deemed "variable", or changing
data. The book (svnbook.org) uses /usr/local/svn, which sounds
reasonable, but slightly in violation of FHS, since a repo is
really "variable" data. So maybe /var/local/svn is best?

I'd like to standardize on something going forward. What is your
preference?

(As a related aside, I can't tell from FAQs/searches if it's
still a no-no to put a repo on an NFS mount. Though "SVN Worst
Practices" hints at it. From what I can tell, it used to be a
problem with BDB or general Subversion locking(?). Am I okay now
to do NFS with recent svn and FSFS? I assume people consider
NFS/TCP superior to NFS/UDP for this.)

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