Tail chasing

I mentioned a while ago that I've been considering building a mini OO layout to give me somewhere to run my SG stock until I can build something bigger. However I'm not sure if that is what I really want so I was pondering if I should build something else. Either something slightly bigger - to give longer sidings and allow the trains a bit more of a run, or build a micro shunting layout, maybe something like an English version of this French micro, or a layout in a box file or two. However I'm not sure how much I'd operate a small shunting layout, and it's not exactly suitable for running intermodal twin sets on. So I don't think don't think I'm going to build any of those options. What I really want is a tail chaser. But I don't have much space so where can I build it? Well I have 3 ideas - first up the loft...