I have Telenet, 10mbit cable for 42euro/month.
At this moment I think activation is free, but at the time (4 years ago) I payed 400euro for it ! (well, actually my parents did

)
Our upstream is capped at 128Kbps (16KB/sec), and we have a monthly downloadlimit of 10GB, and uploadlimit of 1.5GB.
When you download between 23h and 9h your bytes count only for half.
(They call it "night-surfing")
Telenet's system of limits is really complex.... our 10Gb isn't per month, but per 30 days.
We have a 'telemeter' which keeps track of what you downloaded the past 30 days.
So if I download 500MB today, in 30 months I will have 500MB less on my telemeter. Ofcourse, what I download then is added again.
When you download more than your limit, you're put on smallband, 5KB/sec.
What you download on smallband is again added on your telemeter.

In one word: this SUX !

But it's still a lot faster than ADSL. ADSL is 1Mbit in Belgium, that is 128KB/Sec. I heard they are going to upgrade it to 3Mbit (384KB/sec) but that's for the (near) future. Telenet is theoretically 10Mbit (1024KB/sec) but you are lucky when you get more than 650KB/sec.