whats the next performance modification?

In my search for a new set of sails i was drawn towards the flat top for it's performance. however, i got a great deal on a used set of performance sails by calvert with a roller furling jib. i showed the pics a couple forums back if anyone wants to look it up.

anyhoo, now i don't want to waste the money on a new main (flat top) when i just bought one (and i love the color scheme). so i guess my next move is some kind of performance head sail. i'm not worried about being class legal because my new set of sails already blows me out of the category.

what suggestions can you guys make about affordable systems for spinnaker/reacher/screacher.