DR-Z400SM... has better suspension than the E, fully adjustable USD forks based on the RM, plus shorter travel hence lower seat height which is easier to manage - helpful for a dirt newbie. Find some 21/18" trail wheels for it.
And no, a WR250R is neither boring or slow. Maybe not quite as zippy as the F, but designed more for the long haul as befits a dual purpose bike rather than an enduro race weapon. The older less-potent 250 4T trailies, yeah maybe considered slower (only as boring as you are), but the WR-R is the new hotness.
KTM 4T EXCs within the same generation (RFS) are all pretty much the same reliability-, maintenance- and comfort-wise. The 250 has the bottom end from a bigger motor so is uber-reliable but due to the solidity doesn't quite have the performance of the Jap 250Fs. The 450 is a great well-liked all-rounder; the 400 is a revvier short-stroke 450 that turns better due to less engine inertia, some say it finds traction better too; the 525 is a bored 450 that rips your arms off. Peak power is about the same across all the big ones, but the torque curve changes. Weight is the nearly same but the differing rotational masses make them feel different to ride.
As a dirt novice you would be better off on a more modest easier to manage bike, at least initially. Yep, slower on the road but a heap better off it. Do your time, pick up some skills, then move up to a bigger bike. You'll also know whether you want to go more hardcore or more relaxed with the next bike. However that probably conflicts with your motard aspirations, where sheer hp is the winner, pretty much.
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