Thanks everyone for their help and advice.
In answer to ntaw - I haven't gamed recently and when I do it would be at my local Games Workshop store so I would generally not know what I would be up against in advance.
I have always liked the vanguard veterans and I liked the idea of using a front row of models with storm shields but have read the pros and cons of them in the replies. I suppose in many ways it is the building, modifying and painting that I am more interested in at the moment.
I was wanting to make a 10 man squad that if I was to use it in a game it would be relatively effective. I know the points can mount up quickly with these models. if I was using them in a game I could always cut the squad numbers down to say 8.