Well, I'll be on the high side because I do the ultra-minimalist thing with regards to what I carry on the bike. I ALWAYS stay in a motel, and eat at diners and c-stores. Sometimes I travel alone, but sometimes with a buddy. Traveling with a buddy cuts my lodging cost in half.

Here's what I budget for traveling alone:
Lodging = $75, and that's held about right so far.
Food = $35

By the end of the trip, on the couple trips I've taken, this $110/day is about right when I'm by myself, coming down to something like $70/day when I'm with a buddy.

Do you want to count equipment? That would add up pretty quick if you were really honest with yourself in that. (At least it would with me.) My bike is almost identical when touring as when home - just a trunk bag on the back. But I do spend money on the bike, and justify some of that spending with the fact that I don't want problems on the road.

Really, though, I'd be spending something to eat if I were home, and I'd find some other excuse to spend money on the bike, so I figure the lodging cost is my primary "extra" cost of touring.

Way more than it sounds like you're looking to spend, due primarily to lodging, but thought I'd give you my experience on the high side of the range. And btw, I NEVER regret that hot shower and those clean sheets at night...