I was in the same boat for a decade before discovering this forum.
Many really like ProCycle's organized TW200 section of their website. However Procycle can be a bit pricey compared to identical offerings from other internet sites like Amazon or eBay, especially when you factor in shipping for small orders. They are an American re-seller so support them if you like.
Handguard options and preferences are legion, however Tusk brand De-Flex model handguards are a very popular mid-priced option at around $55. Chinese counterfeits of an Acrbis design can be had for under $30 on eBay and Amazon. Some like the clones, mine broke after the first impact. Your results may vary.
Windscreens seen here are usually a small dual sport model called JIMBOSHIELD made by our very own forum member JIMBO. PM him for color and ordering options.