Overdue a sticky on this somewhere....
1. Don't stay in Tropicana - it should have been pulled down years ago.
2. Check the flight times, if you are on an indirect flight, you could have an 18 hour flight ahead of you
3. Check Virgin and BA for direct flight prices
4. Check hotel websites directly, and sites like fatwallet and smartervegas that offer good bonus codes for hotels
5. Add 3 and 4 up and if it comes to less than £800 then that's a big improvement. Package for £800pp = £1600 based on 2 sharing. You should be able to fly direct for <£500 each, which leaves you £600 ($900) for a room. Based on 5 nights, you should be able to get something considerably better for that (+ the direct flight.)
All good points but the Direct Flight is a must 3-4 hours spent in Philadelphia Airport is a lifetime!