Pricing and services: The great thing about Men's Wearhouse is that they're a national chain so you can be sized/fitted locally and then pick up and drop off rental suits/tuxes in Vegas; i.e. no transport and dealing with having them pressed after arrival. Their customer service isn't always the greatest but most people are generally happy with them and their turnaround time.
Now there are three different locations that are reasonably close to the strip, and you can use any of them, but the first one is the one that most people go with and have had positive experiences with so you should probably try that one:
People who have used this vendor (sorted by date) and link to the review:
TK threads mentioning this vendor: