You can never go wrong with OEM Honda parts. Fit, function, and reliability are never an issue. If you have a show bike, authenticity requirements dictate that you stick with Honda parts wherever possible. Of course, if show judges are looking at things like your timing belts, then you have bigger problems!
The following chart lists reasonable substitutes that have performed well for me and many others. This information is available elsewhere, but I decided to post it here for convenience since I’m often asked. Prices are considerably less than the equivalent Honda parts.