I'd add that in my book a dual sport should be e-start. This also usually points you towards the off-road versions of these bikes instead of MX versions, which also gives you a battery, basic lights, softer suspension, kickstand, 18" rear wheel, spark arrestor, etc. Thus, in a Yamaha we're talking about WR450F, not the YZF.

As a sage dual sporter on this forum recently told me, the Suzuki DRZ400s are a good choice since they're bullet-proof, e-start, easy to buy (especially the factory-ready one) and easy to sell. You can either buy the factory-ready DRZ400s or the DRZ400e and add the aftermarket goodies for less weight and better off-road performance. I'm not a Suzuki guy but once I looked at them the DRZ400e with aftermarket parts is the way I'd go, since the 400s is more commuter-oriented (steel tank, locking gas cap, massive rear lights, side reflectors, radiator fan for traffic conditions, CV carb, built-in switchgear for turn signals, horn, etc.).