In open leagues, you're likely to see a lot of guys trying to really run the bases. Get an A+ arm if you can, and I'd be wary of going anything less than an A-, as you'll get guys running all over you. I find catcher usually ends up being a position where I spend more money than other positions, as that A+ arm costs a lot, especially if you get one that will have at least average offense. Save money elsewhere - get a good catcher.