I have an impact/driver set, and I just stick all the bits in my 7in1 screwdriver. I also have a "precision driver set" that I got off ebay or Amazon. Bulldog is the brand. It's ctappy, but has done many jobs over the last year or so. I'd recommend going with bits vs full handled torx drivers. Tips can always be replaced.
I'd recommend just heading to some Ace hardware or sears and pick up a bit/driver set. Probably cheaper than online, and you get it asap. Even an auto parts store has your back.
If you truly want some "lifetime" tools, next time you see a matco or snapon truck outside a mechanic shop, hit them up. Actually got my first decent knife of one of those trucks. And years after I lost it, realized how cool it was that i had it =( it was a #1 of xxx composite edge leek..which I didn't appreciate back then.