£700 is a strangely awkward budget. If it was increased to around £800 you'd be looking at a decent new set from Stealth / Parweld / Jasic, £700 is just shy. You could spend a little less on a secondhand set which might be a good shout. Check out whats up for grabs on ebay, you might find yourself a bargain from R-tech, Parweld etc..
Make sure you see the set working first before you part with your cash (if its secondhand)
3 hours each way
Not that far. I'd be prepared to go a lot further for the right unit at the right price.
Buying new for 700 won't get you a package as good as that.