xScope - quick, to the point, minimal interface, works fine, personally I think it's fugly
Dolphin - nice looking, full of bloat though, some people say it lags, haven't personally had that problem, some odd locations of important things (for example, getting to the bookmarks is not very user friendly)
Stock - personally my favorite but no multi touch
Imported Milestone MT browser - absolutely my favorite, however, keyboard lags when typing on a forum such as this one that is ran by vB code...not sure if this is due to it being an imported code from another phone or if the stock one on the Milestone is this way as well
Haven't tried the Steele, I might have to look into it. I bought both Dolphin and xScope but personally I prefer Dolphin at the moment. Ultimately I don't really care much for either at the moment. Hoping for an update to xScope or mobile FireFox to come out so I can switch.