Best value in a fun flowing pin? XMen LE. I thought it was awesome.
Best flowing pin ever with great rules and good for noobs and pinheads alike? Spider-Man. Rules are great, and not overly complex and it's about the smoothest flowing pin ever.
Great flowing, beautiful pin with the most frustrating mode-start ever? Star Trek.
JJPPOTC? Eh. I heard the disc is ridiculously noisy and it's a "dead horse" theme to me.
AC/DC Premium? It is TOUGH. Tough as nails. When you get flowing, it's a rush and amazing, though. But until then, prepare to nudge your ass off and REALLY dig deep to play well.