I love the NAOMI and own a pile of them, however if your main goal is to play racing games like Initial D then my recommendation is to NOT buy a NAOMI 2 and instead buy a Lindbergh. After you buy everything to make a CF or Net-Boot setup work plus a NAOMI 2 and proper power supply you're up in the $500 range, you can import a Lindbergh and install a multi-kit, and use a cheap PC PSU for about the same price and have a MUCH better selection of Racing titles.
I mean Crazy taxi is fun and all but on Lindbergh you'll get Initial D 5 and Outrun 2 SP... that alone makes it worth it IMO.