John S - Mac Main Sail
The costs vary($520-815), but they allow for ad-ons like you mentioned, stripes, telltale windows, numbers, etc, I believe they also allow for you're own measurements. If you visit their site, thesailwarehouse.com, you can select your own specified boat and choose the type of sail you're looking for and it'll give you a list of results for Racing, Off-shore/Performance, Standard OEM with full battens, coastal, etc. I'm looking for a 150 Genoa, and they seem to be the cheapest one's out there.-Sean