Park aren’t that good tbh. Some stuff is ace, some not. It isn’t the guarantee of quality some folks thing it is.
This is a decent starting point kit:
http://www.chainreactioncycles.com/Models.aspx?ModelID=40997
It’s all reasonable quality and you’d be hard pushed to put together that range of tools for less. The thing about buying only as you need them is that sooner or later you’ll need something you don’t have at midnight the night before a big ride 😉 Does lack a cable cutter though.
The Superstar and On One ranges are both pretty decent- some misfires in both but by and large good value. Lifeline seem to have gone off the boil a bit, they were the go-to choice for a while, their basic toolkit used to be ace.
Bikehand do a kit that gets you a fair amount of stuff, but it’s not great quality… Icetoolz do a good starter which gets you less, but better. But kits are often a bit weighed down with crappy generic tools- adjustable spanners, terrible allen keys and screwdrivers etc.