You should also get a lockring tool for your particular cassette, and a chain whip. If money is tight skip the chain whip. I can afford one and still never bought one. I use an old chain. Put the wheel straight in front of you, wrap the end of the old chain up over the cassette from the bottom, stand on the free end, and loosen. I have never had one that couldn't be removed that way. Park's lock ring tools can be had for $6 or less brand new on eBay.
Other than bottom bracket and hub/cassette stuff, there aren't a lot of specialty tools for bicycles that are necessary. People might like you to think so, but if you have a general assortment of normal stuff you'll get very far.
A Phillips screwdriver, 15 mm wrench, small set of metric hex wrenches, and an inexpensive torque wrench (in NM, can be a beam-type to save cost) will do 90% of what you need. Whatever you do, don't get caught in the trap that you always have to have bike-specific tools. For instance, Park will sell you a pedal wrench for $15.00 when you probably already have a 15mm wrench at home. If you need the thin profile buy a cheap 15 mm and grind it down.