you have several options, sam (plus probably a few I've left out! :lol: )
genz benz el-diablo: probably more metal-oriented, though- but it depends what you mean by hard rock. A lot of the modern rockers use rectos. also has half power operation, to get it down to 30 watts. I like it... a lot.
koch studiotone: probably the only koch in your price range... it's good, but not as good as the dearer amps, IMO. only 20 watts too, so it'll probably do gigs just about.
Engl screamer: very nice, I think the el-diablo is better (albeit dearer), though- but I admit I haven't tried them head to head.
Laney GH- don't know much about this one, I haven't tried it.
Laney tt50 combo: if it's like the head, it's really good. Around £670, if you shop around. I'm not sure if it'll compare tonally to something like an el diablo, though.
Mesa f30: sounds quite modern- definitely worth a try though, as I said earlier, lots of modern rockers use rectos or similarly-voiced amps.
Marshall DSL- i'm not a fan, I don't think it compares to the other amps mentioned, but they're ubiquitous, and you might as well try one.
Ashdown fallen angel: ditto marshall.
Randall RG50tc: ditto marshall and ashdown, except not as ubiquitous!
Randall modular series: might be way over budget, but cool the way you can switch modules. problem is, the recto model was cr@p.
Hughes and Kettner edition tube: pretty much ditto the koch studiotone.
Peavey 5150/6505 combo: good metal tones, and hard rock, terrible cleans. peavey are too dear for what they are this side of the atlantic, if you ask me.
Traynor ycv50blue: I haven't actually tried this one, but the other traynors I've tried are nice- but they do tend to vintage.
Matamp: no idea on the models, but they get a great rep. round here, and by and large, the guys round here know their guitar kit, so it's definitely worth looking into.
there's probably something really obvious that I've missed., unfortunately.
EDIT: orange rocker 30 :oops: : I wouldn't worry about the clean channel, it kicks ass. not much in the way of headroom, though. I wasn't overly impressed with the overdrive channel, though- it jumped from almost no pre-amp gain (i.e. struggling to even hit classic rock) to way too much between about 6 and 6.5 on the gain dial. Maybe the one I tried was faulty, though. Assuming it wasn't, some of the other amps are better, in my opinion, unless you just fall in love with the voicing.