I own an Orange Rocker 30 Combo, and the only reason I plan on ever replacing it is I need an effects loop.
Now the Rocker 30 Combo is awesome for gigs (barely get it past half, and past 7 or 8 on clean), and also for home use, not to mention it's so much easier to transport.
But the Effects Loop is the killer for me. And it just seems spending 400 more on a used 50/100, then spending the money on a Cabinet, You're up to 1,800 or so for a half stack assuming you either get a really good deal on a used 4x12, or get a cheaper one.
For much less I'm personally thinking of going for the Marshall DSL 50 Stack which with some good Ebay deals I could have for 1,100, more like 1,200. Now I've only played the Marshall DSL once at a gig as a backline amp, and it was really sweet. I didn't get enough time to really assess it's qualities but I could see myself feeling like I didn't compromise much if any at all by going with that, other than not have a cool looking orange head on stage next to me (and let's face it, colors grab people, I'm surprised by how much guitar gear is frickin black!).
I'm actually at a dilemma on which to go for. I'm moving towards the DSL as it had a bit more aggressiveness to it. The Orange has the perfect crunch, but it can get grainy sometimes depending on the volume. But it also cuts through waaaaay better than any other amp that I've played. While listening to the other bands playing the Backline DSL amp (the other was a TSL), the player playing the DSL always had a hard time cutting through. That 500-600 dollars could go towards a really sweet pedalboard though.
If Orange would make the 30 with an effects loop, that would just be perfect, ok maybe with a slightly louder clean channel. I'd imagine the price of adding an effects loop to my amp would be the same as just going ahead and getting the 50/100 used.
In Conclusion: For me and my style (Experimental/Hardcore) it is absolutely perfect. I really can't see any other amp that would make me happier. I just wish there was a **** effects loop on the Rocker 30.