Hüsker Dü
Husker Du

According to this totally random list I found, the 25 'Greatest Punk Rock Artists' are:

1. The Clash
2. MC5
3. The Ramones
4. The Sex Pistols
5. The Stooges
6. Dead Kennedys
7. Fugazi
8. Black Flag
9. The Misfits
10. Bad Brains
11. Minor Threat
12. Joy Division
13. The Buzzcocks
14. Husker Du
15. Bad Religion
16. Minutemen
17. The Damned
18. The Circle Jerks
19. X
20. Television
21. Stiff Little Fingers
22. Patti Smith
23. Green Day
24. Crass
25. Gang Of Four

Luckily you don't have to choose. You can go see Television's Richard Lloyd at Southpaw tonight (July 23) and Hüsker Dü's Bob Mould at Maxwell's tomorrow (or you can see Bob Mould tonight too)