In reply to PanzerHanzler:
I can't be of much help as I've done very few semi-equipped or trad routes here. The semi-equipped ones I have done have had pretty good fixed gear on the crux sections but very little where it's easier, so it really depends on how confident you are climbing a couple of grades below the route grade as to how much gear you might need. In general it is only the easier routes that tend to have much available gear, even on the granite, so the grades you mentioned could work ok. Unless you're a particularly nervous leader I'd suggest a full set of wires, up to quite big ones, and then maybe a small selection of small to medium cams. Big gear rarely seems necessary.
There's huge amounts to go at on higher crags, and fine exploratory possibilities. Plenty of things have been done and not recorded or not publicised, so you might find old pegs occasionally, but if you've never tried heading up a buttress not knowing whether anyone has ever climbed it before, then I'd certainly recommend it.