I also say buy tools you need when you need them. If you have absolutely no tools of any kind this might be a good start. But allens and spanners and regular tools can easily be bought individually at Home Depot usually for a better price than bike specific ones. When It comes to specialized tools I have about 4 bottom bracket tools because of different standards on different bikes. Buying a kit will either leave you without some tools you need or with tools you may never need. And tools are actually one thing that I find I can get at my LBS for a reasonable price. You can get most Park, Pedros etc on ebay for great prices including the shipping but on average I have paid $1-3 more per tool at LBS than ebay prices and if I really need something immediately I'll pay that extra convenience fee.