Some of the Fell lines can be quite sharp for a native, generally they're very good hacks tho, and prices are pretty rock bottom at the sales, some people fill a lorry with them and bring on to sell but they won't have much mileage out solo so watch yourself on that front!
While I've bred Highlands for 27 years and would always recommend consideration of that breed included aswell as Fells and Dales, the prices are a lot higher for a ridden pony so you're probably on the right track as you are. And for all my involvement with Highlands, I do still love a good Dales pony as I grew up with some and they're superb hacks, very sure footed and have a cracking mile-eating trot, less bouncy than Welsh but very active and smooth, definitely worth a look. Personally I'd stay at 14'2 or a little under, rather than the newer bigger types since the DPS removed upper height limits but each to their own.
Trick with Dales, esp if buying from a breeder, is to start at the ground up and never buy anything unless it has the hardest feet, flattest bone and best knee/hock/stifle possible. Never start with a pretty head or you'll find you aren't taken seriously in some quarters.. Things have changed and there are a lot more generic M&M types in these breeds now, but the price tags will rise accordingly. Breed Show is worth a visit, near Barnard Castle in Co Durham in July usually.
Edit to add DPS summer show at Streatlam by Barnard Castle on 5 August, might be worth a visit!