The more expensive VPIs have more features, but don't clean any better. Once you get an RCM, you will learn it's more about cleaning technique than whether you move up or down one notch in a product line. Buy the 16.5 with a couple of Disc Doctor brushes and some pure water rinse and you'll be just fine. Some people buy an extra wand or two so they can use a perfectly clean surface for their final rinse.
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