Use whatever you have, cat3 cat5 cat6 it won't make a bit of difference on voice/dsl. That 8000 feet is the determining factor.The feeder wire into my house looks fairly recent (but who knows about the other 8000 ft back to the CO. It's a big wire with 10 pairs inside that comes into the house. Looks like the previous occupant had a lot of phone lines because there are 5 NIDs on the wall plus the old 50s style one that's not used.
The run from the MPOE to the jack will be roughly 80 ft.
I'm told that I'm on the edge for 6/1 Mbps ADSL2+ service.
Use whatever you have, cat3 cat5 cat6 it won't make a bit of difference on voice/dsl. That 8000 feet is the determining factor.