Barhard

I have the Geolander G900 tires on my 2003 Subaru Forester XS AWD. They have a H speed rating and I am not sure if I can use just any tire. I am looking for a good replacment tire and am considering the Avid H4S from Yokohama and the Goodyear Assurance 3Tred. Can anyone recommend a good replacement tire and if the .com 's (i.e. TireRack.com, tireDiscount.com) are a reliable place to read about and buy tires?