I unfortunately haven't played 40K in a few years now but I played Dark Angels when it came to Space Marines. The DA and Cadian Imperial Guard were always my favorite. I get the urge to play often and the urge to make a Space Marine costume just as frequently. Especially with the recent surge in 40K costuming.
i have a space wolves army,13th company space wolves army, chaos death guard army, a steel legion imperial guard army , and a space orks army , but haven't played for years , but i enjoyed painting and converting them more than playing