lots of good advice given...each opinion is a good from the perspective of the individual who gave it...
lots of things to consider to give you an answer that fits your situation....some of the things needed for good advice for your situation are bits of information we do not have... like do you have any existing tools at all.... what type of work are you planning on doing to your bike yourself... what type of bike do you have... do you mind shopping at different stores and taking the time to find tools to save a bit of money...do you just want a tool collection or do you just want tools that you will actually need....in short, we don't really have enough information on you, your personality, your budget and what you want to do...I am not exactly a tool freak, but I have a different assortment (kit) for each type of work I plan on doing...so when it came to bicycles, I just ordered the park professional tool kit... now almost anything I may ever need is in one location...seperate from my motorcyle tools, and my truck tools...I keep a roll around in my motorcycle shed, keep a job box in the barn and now the park tools in my bicycle room.