When I first started out I just used the usual cheap and nasty ones but found them to be unreliable and a pain to wire so I moved to HabiStat Pulse Proportional Thermostats, they come pre wired so no messing about with elec cables and seem to work great (I have also seen a small difference in life time of ceramic heat globes and lowering of my elec bills which is always good).
A lot of thermostats have instructions or product guides available online so it is always good to check them out online before you buy that way you know their ranges and how to install them if it looks to complicated then you know what questions to ask the person you are buying from.
A lot of thermostats have instructions or product guides available online so it is always good to check them out online before you buy that way you know their ranges and how to install them if it looks to complicated then you know what questions to ask the person you are buying from.