what rear would you go with

I need some input on what rear to stay with in my Duster. here is what I have:

440 .030 over
509/292 purple cam
keith black pistons
3000 hughes stall
727 tranny
8.75 rear with 489 case currently 3:91 clutch type
245/60/15 tires

I want something that can cruise a little bit and something that if I want to get in it will stand up and talk. I was leaning on a 3:55 but not sure. I have someone who has a 3:55 489 but it is a cone type. I don't know anything about a cone type. I heard to stay away from them. The 3:91 seems a little high to me. Maybe it is just the exhaust I have on it. Let me know what one you would go with and whether or not to trade a clutch type 4:10 I have here for a 489 cone type 3:55. thanks,Bill