They're all nice, and I would stay in each for different reasons. Of those you listed I have stayed personally at the Mirage and
Luxor, but have spent time in all of them. I don't know when you're going, but if it's pool season, Mirage has the best on your list. Their suites are nice, has a good casino, and the location is prime. The
Luxor suite was very spacious, nice bathroom, but it's a little south strip. The
Venetian I think has the best room, but it's usually too pricey. If all the prices are about the same, then you'll great a very nice room here. The location is also great, being right across from Mirage/
Treasure Island. The
Paris is also in a great location...which I think is the best thing it has going for it. I've never really liked their casino, but the ambiance is nice. If I had to make a ranking based on everything all together and if the Prices are all RELATIVELY the same, it'd look like this:
1-
Venetian
2-Mirage
3-
Paris
4-
Luxor