Ed, Check out Grizzly's web site. I recently got a catalog and they have a nice brad nailer for a price so low I thought it was a misprint. Would you believe $22.95? This is an 18 gauge nailer, 3/8 - 1-1/4". The only pin nailer they list is the PC PIN100 for $149.95, about the same as Woodcraft's price. This is a 23 gauge. It's only a guess but it strikes me you needn't worry about finding 23 gauge pins since PC is behind that size. Since the 23 is smaller I guess it depends on how small you need. I don't know who else sells 21 gauge, and I am unfamiliar with the EZ brand. Amazon has the Senco FP10 23 gauge pin nailer for $138, or the FP10 + FP18 18 gauge nailer for $179.99. If you spend $200 there you get free shipping and $25 off. They also have the PIN100 for $124. Rockler doesn't offer any pin nailers.
If the 21 gauge pins are small enough for your needs then I guess it's the way to go. Woodcraft does have that 100% money back guarantee, how can you go wrong?
"Living in the D" (this means Detroit!)
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