i had one for near 7 years ..just leaned it against the garage wall ..and then went back and started it ...even had the original battery
its a good trail bike for sure very reliable .. gear shaft can be vunerable without a spacer to stop it pushing ...
check radiators a lot of people have them braced ..road gearing its not to bad but not too good for distance .. but will be pretty tall off road
the problem with the dr for distance is getting the gearing right to do both jobs
as its its a pretty narrow box and a very high primary drive too ..there will be a big difference between the dr and the ktm for sure
somone may correct me here ithink its 14/47 standard on the drz i found this a little to tall and went to a 13 ..brilliant off road but revving its nuts off a 65 mph ..
a quick look on gear commander
http://www.gearingcommander.com/ 14/47 confirmed
has the stock 400e at 7574 revs at 70mph .. which is pretty much as i remember it
i think the drz is a great bike for a lot of reasons but for 200 mile road work id be a little wary if any long motorway stints were on the cards
its got the big 32ml locknut and tab on the sprocket too ..so popping a 15 on could be done if you are doing a big trip ..so as im sure your aware ..it can be overcome
its a pity more bikes dont use the little retaining bolts with a coller like the xrs to make the job easy

push comes to shove your not exactly standing still at a staedy 60mph 120 miles from home .. B) but it will be a bit lacking on the motorway for sure
other than that if it just the odd longer road trip with no rush fill your boots
60mph is a nice pace on a bike with off road tyres anyway
..im sure you will take to it well i really liked mine no complaints at all
