Defiantly don’t go with neostrada, this is a temporary offer with neostrada giving a good deal as it is a reaction to them being in trouble with the monopolies commission over unfair practises. They will soon be up to their old tricks again I should know because I proofread all their internal communication with France Telecom and you should read some of their proposals they are shocking.
The best offer out there at the moment is onet, or look to a local provider there are many. I am with Pulnet here in Pulawy and I get 2Mbs speed, unlimited download each month and costs 50zl. And I agree
Chello is much cheaper and much faster. 12 mbit chello ADSL is even cheaper than 6 mbit Neostrada.