You'll love the DR compared to the Ninja if the little 350 is frustrating you.
I started out on a four cylinder FZR250R Exup 17,000rpm screamer, had 4 high powered superbikes in between that and my current DR650 including a brand new injected GSXR.
Overtaking is not a problem if you know how to ride and use momentum and plan overtakes.
The standard suspension is a bit soft but that is an advantage in itself on our shite roads. On a twisty road where your dreaming of getting your knee don on the ninja you'll be laughing hysterically as you pass sportsbikes around the outside on hairpins, the extra suspension travel means your never really worried about the front tucking.
The DR is very crash resistant, I've thrown mine about and its cost me nothing repairs except for tweaked bars but thatb was an excuse for nice renthal bars.
They benefit greatly from an end can but you could cut open the standard pipe and re engineer it to keep it looking lams.
Lams compliance only matters if you have insurance, moist cops wouldn't know the difference betweena tweaked DR and a standard one, and that's if you get pulled up in first place.
Just been up top cape reinga and back on mine, no worries at all....
Every great cause begins as a movement, becomes a business, and eventually degenerates into a racket - Eric Hoffer
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