If you're commuting you really want a screen. Some fairings too to keep your legs dry - semi faired will do.
A top box is perfect for a commute, but make sure its big enough for a laptop or whatever it is you need to take in with you. A Lomo bag on a rack or the pillion seat is not a bad alternative, but you don't want to be lugging stuff around in a rucksack... it soon gets wearying.
For secondhand, You might add a vstrom 650 or a versys 650 to your list. An sv650s isn't a bad option,and cheap as chips, but you'd have to sort something out for luggage.
If you're looking at new or newish then I'd be taking a look at what cfmoto or voge have to offer. But it's not worth buying new if there's no dealer support near you.