Rolled sirloin in our humble opinion strikes exactly the right compromise between taste and tenderness. Our sirloin has a good level of marbling and fat cover through it so when cooked rare you will get a rich beefy flavour and it should just melt in the mouth. Some would say this is the best roasting joint you can get.
Depending on appetite, you can feed 3-4 people per 1kg. Anymore than 3 adults and you may want to look at 1.5kg and up.