Welcome to the Horde! That's a fine looking ride, and I'd say you did well for £2,000.
I like the Dunlop K70s on my Iron Barrel. I think they also get semi-decent purchase in the mixed surfaces over which I occasionally may briefly ride. In fact, I'm just about to renew the rear one again after about 8,000 miles, though my riding style might admittedly be described as "sedate" or "like following Grandma to the Doctor's", as another esteemed member once put it. Opinions on rubber vary, so a good rummage through the Forum Archives would be in order to read what other folks think of other options. Notably, a lot of folks prefer the Avon AM26 "Roadriders" upgrade over the OEMs, but others are happily tooling around on all sorts of brands.