Best Enclosure for Open Top Ride
 

I have a 1970 Blazer which has a fully removable top from the windshield all the way to the tail gate, so there's no top for any sort of cabin gain. I have a top, but I want to build the system for without it since I have never used it.

I would like to run 2 12's with a ~1K watt amp and I'm open to any suggestions for both the subs and amp (looking to spend $800 for all materials, enclosure and wiring included). I have Polk Audio 6.5" components for the kicks, Polk Audio 6.5" coax's for the rear panels running off a 4ch Kenwood 750 watt amp for now (can anyone recommend an upgrade for this too?). I won't be entering to any type of competitions obviously, but I would like to be able to hear the lows while doing 65-70 mph on the highway and sound pretty good while doing so.

My biggest concern is enclosure type as well as design. After a lot of reading the consensus seems to be a downfiring box but I can't decide between a sealed or vented enclosure. I can easily build the sealed on my own, but would need some guidance with a vented (guided to the right website/software would be fine too). I listen to mainly rap/hip-hop but also listen to a lot of rock/classic rock/R&B if that makes a difference.