+1 on the Zeiss Conquest, they are very good. Only downside is they don't make an illuminated version until you get into their much-much-much-more-expensive Victory line.
Personally I find with my eyes I greatly prefer a little illumination when things get dim - those black crosshairs just aren't clear enough for me.
I've heard mixed things about the Accupoint - everyone raves about their illumination system, but the actual glass clarity gets mixed reviews, and I haven't found a place around here that stocks them, so I haven't been able to see for myself yet.
I recently bought a Leupold VX-3 4.5-14X50 LR IR with the Boone & Crockett reticle; it's not small but it's an excellent scope for very-low-light work at intermediate to long ranges, and the VX3 glass is pretty good, almost as nice as the Conquest. It's on the large side, but it's not too heavy.
The Leupold VX3L series are excellent, and they allow you to mount a massive objective very close to the bore, so those might be worth a look too if your #1 priority is light gathering.