For the '01 you can consider a VCDS lite interface as well. Some of our customers opt for that version because it is significantly less expensive, but perfectly adequate for basic stuff like setting timing and IQ. (only works for the older cars though)
That version of VCDS is shareware and you can use a less expensive interface. Just make sure you download the software from the ross-tech website and don't ever buy any cable that comes with one of those little CD's. Only download the software from ross-tech!! The activated shareware version of the software ($99 from ross-tech) does everything you want for your '01.
But if you have a 2004 or newer TDI, you will need a full "smart" interface version. Hex+can recommended.
There 's a function comparison chart on the ross-tech website.
http://www.ross-tech.com/vag-com/vag-functions.html