Great replies guys.
I only use a Megrez 110 and 80mm guide scope, so with cameras etc, I am well under weight. I was going to look into a GSO RC8 and guide scope, so should still be well under weight too.
When I sit down and analyse it, I think my biggest enemy is probably location, being in the suburbs and all. I was just thinking a better mount might get me better stars through the seeing. Cheaper going for some narrow band filters, I think.
Thanks again.