Most Chinense varieties are long season peppers and will be hard to grow in your area unless you are able to start growing early indoors. That being said some of the more hardy and prolific varieties I have grown are

medium heat: pequin (c. Annuum) cayenne (c. Annuum), Thai (c. Annuum , Aji omnicolor (c.c baccatum) and Aji Amarillo (c. Baccatum)

hot: orange habanero (c. Chinense) sugar rush peach (c. Baccatum), fatalii (c. Chinense), and Jamaican hot chocolate (c. Chinense)

I'm also in MN - usually I have a horrible pepper turn out but this year is totally different! Yesterday alone I harvested 1.5lbs of Jalapenos from my three plants. But like I said, it's never consistent for me. My sweet banana peppers are doing great, also. I have never branched out past Jalapenos because they haven't done well but I might next year!

Try fish peppers, I love them and they grew well for me on my first try

I'm in Idaho, but the pepper that fruits the fastest for me, so far, seems to be Randy Sine's Evil Jalapeno (both years I've grown in; well, it was one of the first last year, but it was the first to set fruit that I found this year).

You might try Ring of Fire; it's not 60-days for me (it might be for you), but if you let them all ripen, they should all get ripe at once before the end of the season, anyway. It's prolific and the peppers look a very nice shade of red.

Aji Omnicolor is one I grew last year, and I'm growing lots of it this year from seeds I saved last year. It's not exactly early, but it's early for a C. baccatum pepper. It's got a nice, fruity flavor and small peppers. It's maturing faster for me, this year. I think saving your seeds generally will help you to get earlier peppers for some varieties (due to acclimatization). Also, you might try giving them extra zinc and phosphorus among other things, if they're having trouble maturing. I think a lot of our soil seems to be zinc-deficient. Cal-mag supplements seem to be pretty popular with peppers among enthusiasts.

I like to grow peppers in 10-gallon moving totes. They seem to grow faster in them, and the plants get a good size. You can do 2 plants in one tote, but if you do one plant, they seem to get bigger (bigger plants andI assume larger fruit). Either way, I like them a lot better than 4-5 gallon buckets.

I like Chervena Chushka quite a bit. I grew three plants in an ~18 gallon moving tote last year.

You might like Feher Ozon, Lipstick, Roumanian Rainbow, King of the North, and such.

If you want a C. pubescens pepper, Aji Rocoto Largo is an earlier one.

I am in Wisconsin in 4b. you can grow just about any pepper plant successfully from seed and get a good harvest up here. The key is to start them inside a couple months before you are able to put them outside (should be late May for you). Plant your seeds in small containers with potting mix in early March and nurse them through until it is time to go outside. I have grown habs, bhuts, reapers, thai, fish, jals, cayennes, and two to three dozen other varieties with great success.