Am planning a 10 day trip to Sri Lanka this year end (26 Dec - Jan 4).
Places I intend to visit are Anuradhapura, Dambulla, Sigiriya, Polonnaruwa, Kandy, Horton's Park, Nuwara Eliya, Galle (already booked a hostel) , Colombo (will stay in friend's place).
Would appreciate suggestions for decent budget accommodation for 1) Cultural Triangle Base 2) Hill Country Base
Mentioned in this answer:
Hi' I've just got back from Sri Lanka and I don't what you budget is, but we found some decent hotels at a budget price just looking at hotels.com and booking.com.
Else have a look at http://www.hostels.com/ which seem to have a good selection of hostels. There should be plenty of options.