I'm not big on packaged tool kits because they generally contain tools that you rarely use and I also like different brands for particular tools.

The first thing that you need is tools for fixing flat tires. A pair of tire levers a patch kit and a pump will do that. Bigger pumps are better - mini pumps suck because they require too many strokes.

For basic tuneing you'll be surprised at how far a set of metric allen wrenches will take you. A cable cutter (Shimano), chain breaker (Park), spoke wrench (Park), cassette tool (Park) and chain whip (generic) will get you by.

Hub cone wrenches (Park) and a cartridge bottom bracket tool (Shimano) will be necessary for basic overhauls. A headset press and wheel trueing stand are nice to have but you can really work around not having them. I also have 2 torque wrenches - a 3/8" drive for cranks and bottom brackets and a 1/4" drive for installing high end stems and carbon handlebars.