thanks for the help guys i will contact the company as soon as i decide which one to get.

Its between. Helix DBS1000 Proportional Therm and the Helix DBS1000 Prop. Therm. w gnd which i think the only difference is that one has a night temp drop feature correct me if im wrong. and the Herpstat Proportional Thermostat ND and the Herpstat Proportional Thermostat, they all seem very good, what makes one better than the other? should i just get the cheapest one which is the Herpstat Proportional Thermostat.