I'd pay £270-£300 if those flights were direct from Manchester, but judging from the other posts there's going to be too much downtime spent hanging around at airports, train stations and ferry ports, and before you know it, you've committed to 3 or 4 nights and spent £1000
More importantly I'm also hoping to do all the CL away games and that first fixture might be just a few weeks after the actual draw with zero chance of an official trip or cheap flights, albeit somebody will inevitably pretend that they only paid £39
If I'm going to pay way over the odds I'll save it for then.