You able to do any of this yourself? Basic service on an SV is pretty easy. Just change the oil filter (about £7) and replace the oil (about £25).
How many miles has it done? Unless you've been asbolutely ragging it, like track days galore, probably find that the valves are fine. I checked mine once and once only at about 30k and they were fine. SV is a relatively low tuned bike. Apparently if they start to go they'll go early, say up to 20k, might need a small adjustment again at 30k, but from what I have read some basically never need adjusting. The CCT though I have never done, so I don't know about that.
Chain and sprockets, for a decent one you are looking about £100-£120, go DID or good brand, and go rivet type, do not get the link type. Decent rivet tool, about £40, do you have a paddock or a centre stand?
Even if you have to buy a paddock stand (which are handy things to have anyway) you'll save yourself a ton of money and give yourself something to do on a sunny afternoon with a beer and the radio on?
EDIT: Oh air filter, forget that, still pretty cheap about £20 for that one, easy to replace.
