I usually like to try a couple new peppers in my garden. Two that did well in pots about bookend the hotness (Scoville) scale from mildest to one of the hottest:
Candy Cane Chocolate Cherry Pepper
Days to Maturity: 60 to Green / 70 to Red Ripe
Height: 18 - 24 Inches
Spread: 12 - 18 Inches
Fruit Size: 3 ½ to 4 x 2 ½ to 3 Inches
Scoville Heat Unit: 0 - 100 SHU
This fiery little tobasco-type hot pepper has juicy thick-walled fruits which pack some heat! At maturity the peppers are red, slightly triangular in shape and about 1.5-inches long, with 500,000 Scoville heat units.
If interested, I get most of my seeds from seedsnsuch.com, though I think I bought Buffy as a seedling at a local nursery.