Ah, the classics!

Now we come to the next question; how mobile will you be? Access to a car would be quite helpful, though not vital.
Both your targets are Schedule 1, which means I am limited in what I can say, but at Budleigh you are very close to RSPB Aylesbeare - reachable by bus, in fact! - which is the 'official' site for Dartfords. Also probably the best place to see them, too.
The official Cirl site is RSPB Labrador Bay, which is the other side of both rivers Exe and Teign, and while also on a bus route, is a bit of a journey from Budleigh on public transport and at least a half-day trip in a car.
Cirls are expanding all through Devon and have crossed the Exe, which means you could find them in suitable habitat even close by, though they are thin on the ground. They are by far most common down south; a car trip to the Prawle area is a long day, but the closest to nailed-on you can get. Pick a sunny not too windy day.
Also the same advice for Hares, though to the west of Salcombe [The Bolt] is where I've seen most. Other hopefully know more.