I think the Bellagio rooms whilst a little dated are still very nice rooms and the tube tv thing isn't really a big deal. They've also said that they will be remodelling rooms in 2011 so you might be able to bink an upgraded room at checkin should they have started before summer.
That link will get you a discount up to 20% depending how far in advance you book on your room.
https://reservations.mgmmirage.com/bookingengine.aspx?pid=190&host=offer&code=B20MARWynn is also remodelling all it's rooms at the moment and they hope to have it completed by summer too. The only code I know for the Wynn atm is EARLYBOOKING and that doesn't always work out that cheap anyway.
www.smartervegas.com and
http://www.fatwallet.com/forums/travel-discussion/1036400/ are both always worth checking out as they have some great deals for hotels which are updated all the time.
The Mirage has just undergone a renovation and the reviews I've seen have been mostly positive. I think there are often promotions for them too through the year.
I think if you're going with partner then as was advised you don't want to tie yourself into a poker rate. I'd just keep checking and see what rates pop up for sites. I stayed at both Wynn/Palazzo last year and loved both of them except the cost. You get what you pay for though and they are both great resorts.
There isn't such an atmosphere in Palazzo as it's a more subdued resort but the restaurants there are pretty great.
The Wynn is well it's the Wynn and the little touches just make it special. If $$ isn't too much of an issue I'd stay here every time as the whole feel of the place is just incred. The trip costs grow considerably if you're lazy like we were and just eat/drink in the wynn all the time lol.
I saw Le Réve and Terry Fator last year and highly recommend both especially Le Réve it's sick