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The 470 with 3 individual meters is a nice unit, the 490 is a newer version of the 470. If you are going to pick up a 490, I would buy your 470. I am working with an old Sencore right now.
The 470 has a single meter.
The 490 is just a redressed 467. Internally they are electrically the same as a 467. There are several 490's on ebay right now.
Now the 490-B is totally different story altogether. It's a very sophisticated microprocessor controlled rejuvenator and it uses different adapters than previous models. The 490-B is a top-of-the-line model well worth the high price it commands.