Applying antifouling is not very hard to do, check this document: http://www.boatspeed.eu/downloads/Painting-a-regatta-boat-hull.pdf
You might even get away with not applying an epoxy primer.
IIRC the cheap stuff is a little heavier due to copper content.
The "good" stuff (Like this, Nautix A4 is specifically designed for racing and will probably not hurt your performance in any way.