I really like NuMex Vaquero, if you're looking for something you can find commercially. CAPCOM's xalapas are tastier and hotter, but less productive.
Last year, Pepperlover's Cracked Jalapeno performed really well and are hot and tasty. Don't tell anyone, but Burpee's plain ol' jalapeno is ridiculously productive for me. Like broken branches productive.