Every night is a party night in DR :) I noticed you didn't mention Jewel in Palma Real Shopping center. Akon owns it. Just mentioning it in case you were not aware.
Based on the dates you will be there I think you would be good for Friday, Saturday and Sunday.
Sundays at Imagines is "Glam Ladies Night"
Imagines actually has a lot going for it and attracts lots of people. It is in an actual cave, offers the cheapest VIP tables compared to the other 3 tourist clubs and they offer packages which include transportation to and from your resort so you save on taxi's.
you can visit http://www.imaginepuntacana.com/ for packages, what night is which event, etc.
With 7 of you guys though you can get a VIP table for 200$ (6 - 8 people) and buy a couple bottles. Think you would have a great night there or even all weekend.
The only thing I can really recommend that you do is visit the nightclubs websites. They all have facebook pages to.
See what events and special guests, etc that are taking place while you will be there. Oro, Jewel usually host events on Fridays and Saturdays, foam parties, white parties, beach parties, special guests, etc.
See what appeals to you more, the pictures of the club and go by that.
Keep in mind each drink is 6$ and up per drink. VIP for Mangu, Jewel, Oro, is more expensive then Imagines.
Also if you did not want VIP at Imagines on their site they sell a 60$ package. The gives you cover 1 night, OPEN Bar 1 night, and transportation for the week.
Another thing is what resort are you staying at?
The 4 clubs are spread out and you would require to take taxi's to them except Imagines if you get a transportation package.
Knowing the resort you will be at will help. Maybe your close to one club that you can get to easily on Thursday night and make it a 4 night party instead of 3 :)