They are all more or less the same, just Google around and see the best specs you can get (RAM/CPU matter most for botting) for your budget, it's as easy as that.
There are 100s out there, just find the best offer. Best to stick with ones that aren't highly botted on too, safer that way. And with so many out there it's not hard to just pick one and be fine about it, rather than use one that supplies mainly to botters.