The forks are ok for "normal" riding I feel. But also being a previous supermoto owner (KTM 450SMR & KTM 560SMR), it didn't take long to find the limits of the stock fork. If you ride aggresively, you'll most likely find the limits also. But, if you love your DR-Z and wish that it was a lot faster with cool gadgets like TC and ABS, adjustable throttle control, etc....and you can ride it comfy all day....You will LOVE the Hyper, in any of the models (Hypermotard, the SP, or the 'Strada). My 560SMR (street legal also) used to be, hands-down, my favorite motorcycle out of the 17 I've owned. Growing up on dirtbikes just made supermoto feel normal; I just hated that riding them more than 100 miles was so uncomfortable.
Check out your nearest dealer, mine was great about their demos and let me take a 'Strada all day long. It worked because I returned it only to trade in my CBR on it. I'm not telling you which route to go, but if your funds allow it.....Here's what I woudl do if I did it over again:
Buy the SP and then order a windsheild and (maybe) the bags/panniers. Simply because the suspension itself is worth the extra money. I'm waiting the dealer to install my Andreani (imported from Italy) fork cartridges now. They cost $890, and probably about another $300 to be installed. (The tools to do the install myself where nearly $250, and I couldn't justify buying them to use them once). And I have only used the bags....never. Ha-ha Literally I have never installed them to ride. I have a small tank bag and that's all I really use. For some reason I thought having bags would be great. But even with my fork upgrade, they still won't compare to the 50mm Marz's that have another inch of travel; and likewise with the rear shock. The Ohlins is top-notch. But...I do love the small sport-windsheild on it. The SP also include a radial brake master cylinder which performs much better.
To each their own, but if I did it again, that's the route I would go. But because I would lose my *** to sell or trade....I'll just upgrade as I can afford it. Ha-ha
Good luck and go take a test ride!