Yep you can do this cheaper if you want to (but nothing wrong with spending your dosh if that's what you so choose!) I have a 3/2 booking, arriving 13 Nov, and am paying £750 for the
Disneyland Hotel. Eurostar has cost me another £150 or so (but that's because of the trains I want, could have done it cheaper). So over a grand for the HNY seems a bit steep to me.
Book hotel and park tix with Disney - book on the phone and you can pay a deposit now and the rest later.
Eurostar - book direct on the eurostar website. Yes you pay upfront but you can pay as little as 29.50 ppn each way depending on what train you get. Don't know if you can get the disney direct train for that price, if not don't panic just get any old train into Paris; one change on the metro then get the RER A line out to MLV-Chessy (DLP station). I find this is actually a better way of doing it - you can get a train at a time that suits you, and can get to the parks earlier (if you get a train at stupid o'clock, of course, like we do!) We also sneak in a cheapo night in Paris as well, on the grounds that we can then travel late from London after work and then get up early and get to the parks before they're even open, check in, get EMH tickets, get in there FAR earlier than the London train arrives.
Hotels - obv up to you where you want to stay and what you want to spend but you have chosen the second most expensive hotel; have a look at the facilities etc in the other Disney or onsite non-disney hotels and weigh them up for price/convenience etc.
3 for 2 or 4 for 3 offers go quickly so if you do want to capitalise on this I would urge you to find the 10% of the package price now to secure your booking.
HTH
EK