Go straight to vegastripping.com. Absolutely the best source for BS-free reviews and opinions on everything Vegas - especially where to stay and where to eat.
No other web site comes close.
Where you stay will be determined by what your group wants. Don't go for just the cheapest rate or you'll find yourself in the former Imperial Palace hellhole.
Unless you want to stay downtown - do not stay anywhere that isn't on the strip. Mid-strip will give you the most options traveling north and south on foot.
On the lower end, we've stayed at the remodeled Tropicana and enjoyed ourselves greatly both with just us and with a group of friends. Location is decent, the property is not super-huge and the pool is a great place to hang out.
Mandalay Bay used to be nicer, but the service has slid downhill big time and it's at the south end of the strip - lots of walking/tram-riding.
THE Hotel at Mandalay Bay - nice all-suite hotel - been there too ,but again, location can be an issue.
Four Seasons - super quiet, excellent pool, very low key and relaxing. Not cheap
Luxor is kind of a dump, but OK. Again - on the far south end of the strip. Pool area is big enough but kind of meh.
Love the Tropicana.
Stayed at Vdara and it was quite nice - a quieter place, no casino of its own. All-suite hotel with full kitchens and immediate access to Aria, Cosmopolitan and Bellagio.
Been at the Paris. Nice enough but the pool is shaped like a petri dish for a reason - blech. Great location though.
Wynn and Encore - swankus maximus. Always stayed in a Tower Suite room for access to the semi-private pools at the Wynn. Not cheap, but very good location to stroll to mid-strip.
Never stayed at MGM, but they have remodeled their rooms recently and the pool area is huge. Decent location, but boy the place is big.
Prime location hotels will be Caesars, Mirage, Treasure Island, Venetian/Palazzo, Bellagio, Paris, Harrah's, Ballys and Flamingo. Right in there location-wise will be Vdara, Cosmopolitan and Planet Hollywood. I'd avoid Harrah's, Ballys and Flamingo - the chance of a crappy room at those three is a bit too high for me.
Post the places that catch your attention and I'm sure you'll get opinions. And go to vegastripping.com!
I don't necessarily book my hotel and flights at the same time unless it's a smoking deal. I like to book flight & room separately.
And, if 2 or 3 of you are arriving at the same time - book with Presidential Limo. Round trip online special is about $100 and is more than worth it - trust me on this one.
The Village Idiot - here for your entertainment.