Questions about buying sails are almost as popular as questions about which boat is right for me. There are many threads on SBO on this topic. Searching the archives will either be enlightening or overwhelming. A few comments about buying sails.
Almost all sails are now built overseas, in Asia, Sri Lanka, or South Africa. Big name lofts, like North, Quantuum, Doyle, UK, Ulmer and so on use the same lofts and the same lofts are used by less familiar brands. The big differences between the big name guys and the smaller guys is the franchise fee they charge and the design. Although there are talented designers at independent lofts, like Great Circle Sails. The big name guys charge more because of the brand.
For most of us, service is an important factor. Using a local independent loft or name brand is often a better choice than going through a mail order house because someone will come and install the sail and if there is an issue it can be taken care of locally. Simple mistakes happen. I recently ordered a new mainsail from a smaller loft that was not near me. When it arrived the building loft (in South Africa) had installed the wrong slugs. If I had used a local loft, I would have called them to come and get their sail and fix it. Instead I had to take the sail to an independent loft and have them fix it. The original loft paid for the fix, but there was an inconvenience factor. On the other hand I think I got a better designed sail for less money than the local independent loft would have provided and less expensive sail than North or Doyle would have provided.
Pricing is also seasonal and dynamic. The building lofts want to keep busy so in the off seasons the prices are a bit lower. North uses a dynamic pricing system based on capacity at order time. When there is excess capacity, the prices are more favorable to the consumer.
With a new sail you will see improved performance even thought you are "only a weekend sailor" sailing fast and flat is more fun than slow and heeling. A Dacron/polyester cross-cut sail will be fine. Two full upper battens, 2 partial lower battens, and loose footed with one reef and a Cunningham will easily meet your needs.
Brian Hancock does a nice job of explaining the ins and outs of sail purchasing on his blog. Enjoy your new sail!