Started with 512 (IP - 64K/s)/128 (IP - 16K/s) two years ago, 2-3 leaps ahead later, I'm now 6347 (IP - ~800Ko/s)/ 667 (IP - 83Ko/s).
I give the IP synchronizing rate, multiply by 1.2 to get the ATM rate (i.e: 6347 IP = 7616 ATM) which is what my modem tells me it's synchronizing at.
For the same price: 29.99€ (36.93$, 20.51£).