I've got a Laney VH100R, and at the moment, a Marshall JCM900 1936 2x12. I don't like the cab too much. It's hard to get a decent sound out of it. I'm after a cab that will go very well with the tone of my amp. I played through a Matamp with Hot 100's a month or so ago, in Sheffield. It sounded really good!
But does anyone recommend anything else?
For a decent 2x12 a a reasonable price, there's the Orange 2x12 - but only if you like V30's (as it all become rather expensive once you start buying new speakers as well). If you have a greater budget than the Orange then there are a number of boutique cabs you coulds look at. For example, the Bogners are supposedly outstanding.
The new(ish) Laney GS212ie is a great, solid cab (and amazingly cheap). It's a good size too, with plenty of depth. However, the speakers (70/80's) are IMHO really quite unpleasant, and very much on the bright side.
A good option could be to get the Laney cab (about £185) and then get a couple of G12K-100's to go in it. I second Roo in saying that they are great speakers for what you are probably looking for. They also have high power ratings, which is essential for playing a 100W amp through a 2x12.
The other option to investigate might be to have a chat with MartinW from Martamp (MJW amps). His cabs are excellently made and reasonably priced. However, I suspect you would do better with a fully closed back cab and I'm not sure what he's offering in that way at the moment in a 2x12.