Something else, how fast do you want to be able to watch this? Arrested Development is 53 episodes, but you can probably knock it out in less then a month. It’s very easy to watch two or three episodes in a row. OTOH, Six Feet Under is 63 episodes, but watching that show takes me several months. Even if I watched it every single day, I typically can’t watch more then one episode a day. It’s just to draining. But it is, however, one of my favorite shows ever. Also, as someone else said, if for no other reason, it’s worth watching for the finale alone. But you’ve been around here long enough to have seen plenty of threads on “Greatest TV Moments/episodes/finales” to know that and I don’t want to work it up so much that it’s a let down.
Psych is still on, but I watched three or four episodes a night of that show and got caught up pretty quickly. OTOH, there’s about as much continuity as The Simpsons, so you could watch the current season and the old seasons at the same time without any real problems. There’s only one real commonly occurring theme in the show and if you watch the new season you’ll see where it goes, but it’s not a big deal. My only problem with the show is that since there’s no continuity and it’s a formulaic show, watching so much of it so quickly I got a bit burned out. It was nice when I got caught up and now I’m only watching one episode a week.
Another good option is Pushing Daisies. Not on Instant right now (I think Amazon Prime might have it for free). I watched it after reading absolutely not one single bad thing about it…and I have nothing bad to say about it. It was a great series. It’s too bad it was cut short, but that does make it a quick watch. Another good one to breeze through in a few weeks. It’s definitely something else I’ll watch again if Netflix brings it back to instant. They also had no shortage of cameos.
I also picked Desperate Housewives because, c’mon, it’s fun to get wrapped up in the drama and there’s a lot of drama. Unlike AuntiePam (and we watch a lot of the same stuff) I thought it was all pretty good up until this current season. It’s a soap opera, you have to remember that. It’s all manufactured drama.
Lastly, I just noticed you had HIMYM on the list. That’s another great one. I wouldn’t go out of your way to watch it. Don’t get me wrong, you really should see it, but the reruns are on all the time. Just set your DVR to start picking them up (say, 10 at a time or so) and watch them as it records them (or watch them when they’re on if you don’t have one). That’s what I did. After you’ve seen 20 or 30 or 40 episodes, you’ll catch on to what’s going on. Most of what happens is funny even if you don’t know who’s dating who or whether or not Lily and Marshall are married or still dating. After a while you’ll be able to watch an episode and pretty quickly be able to figure out where it fits in. Focus on one of the other shows and shoehorn HIMYM into your free time, it’ll work out best that way.