Well, there is (or was) the Brompton toolkit that cleverly fits inside the frame:

Brompton Tool Kit

...but the tools look a little lightweight for anything other than on-the-road repairs.

Unless you plan on rebuilding the hubs or headset, or removing/rebuilding the crankset/bottom bracket, a general set of tools should be fine.

I'm not a fan of general tool kits unless they're high quality tools to begin with - Park and Pedros come to mind.

Otherwise I think anyone is better off buying good quality tools one at a time and adding as your needs dictate. A nice set of P-handle hex wrenches, a nice set of metric open end/box wrenches, couple good screwdrivers, pair of cable cutters, maybe a third hand brake tool...that's where I'd start. Good workstand comes in handy too.