Being in Zone 4, I think "short season". I don't know if your customers have enough time to grow most C. chinense to maturity unless you sell them 6 month old, 3 foot tall plants.
Lemon Drop (C.baccatuum) is a great pepper, but it can take 100 days from plant out to mature fruit. A Bhut Jolokia can take four to six months!
I'm thinking C.annuums might be a better choice. So, with that in mind, here's a few I came up with you might want to look at. Most are 80 days DTM, or less.
Golden Cayenne - Hot - 4 inch yellow fruit. Prolific. Good for powder. (80 days)
Large Hot Cherry - Hot - 1-2 in fruit. Heavy crop. Good for stuffing, pickling. (80 days)
Fish - Hot - Variegated, ornamental. Good for pickling, powder. (80 days)
Peter (Red, Yellow, Orange) - Hot - Novelty, good for powder (90 Days)
Pretty Purple Pepper - Ornamental - Purple leaves & stalks. Purple to Red fruit (75 days)
Numex Joe E Parker - Mild - 6-7 inch tapered, thick walled. Deep green to bright red (65 days)
Jalapeño TAM - Mild - good for pickling. (70 days)
Sport - Mild/Med - good for pickling. Used on Chicago style hot dogs. (75 days)
Jimmy Nardello - Sweet - Deep red, Italian frying type. (75 days)
King of the North - Sweet - Green, short season cool weather bell. (70 days)
Hybrids
Carmen - 2006 AAS Selection - Red, sweet Italian frying type. (75 days)
Gypsy - 1981 AAS Selection - Yellow, sweet bell type. Good in cool weather. (65 days)
There's certainly a lot more out there to consider. These are just a few that I've grown personally and would recommend to others.
Good luck to you this season.