If I may...? I think you really, really should go for the onboard USB. It'll open some expansion options up for A500/600 users that they might not have had otherwise - I mean there's always folks asking "How do I get xyz files from my Amiga to my PC..." well a cheap USB/ethernet dongle would be at least as fast if not faster than a serial connection, wouldn't it?
Plus: mice, keyboards, external storage (mmm...an A500 with a sweet external CD-RW or even plain-jane CD-ROM or HD), other input devices, etc.
Consider it. Please.
