Red Zone and Lean&Mean are "Fitness" level (i.e, they aren't as challenging...ahem...as the Competition spinervals).
I have almost all of the Spinerval releases. My favorites are Hillacious (just over an hour)---it's difficult but fun; Uphill Grind (42 minutes or so of climbing, all female cast); Suffer O Rama (an oldie but goodie, under an hour); Zoot Challenge (41 minutes--tough, good combo of high cadence work with a few higher gear sets); Time Trial Special (about an hour, I think this might have some one leg drills); and the three new releases from this past spring (one of them is called The Pain Cave, one is technique focused, and the third is Super High Intensity or something like that---all are less than an hour long and are more 'classics' in terms of sets), etc.
I really like the strength-focused releases, too. Bending Crank Arms (it's just over an hour); Big Gear Strength (about 55 minutes), and Ultra Leg Strength (an hour or so). All three have some off-the-bike work (squats, lunges, etc), which mix it up.
Bad weather and Spinervals definitely give me a greater appreciation for riding on pavement!!