Funny you should ask...
I asked the same question a few months back, made an arrangement with a fellow BARFer and at the end of the day just bought the bike from him. YMMV. It looks like you went from a Ninja 250 straight to an SV1000, so one caution is that a DRZ, power-wise, is going to remind you a lot more of that 250 than your current steed.
Otherwise, it really depends on what you plan to do with it. A DRZ is (IMHO) awful on the freeway, but you have the SV for that. On the other hand, from Freakmont it's a short jaunt to Calavaras, Mt. Ham, etc. and a DRZ will absolutely shred those roads, soaking up the bumps and ruts along the way quite nicely. Great for poking around in town too.
Back to borrowing/renting a DRZ: some folks may be willing to just swap bikes with you for a ride or a day. Before ever throwing a leg over it the arrangement I made was an agreed rental price and an agreed purchase price along with cash in hand to buy the bike outright if I dumped it (I didn't dump it, I just liked it). You might be able to find someone selling one who will work a similar arrangement.