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You're lucky. In Texas, we only have 6 letters. My tag is "U WANT 1". How about "HI HO SLV" for yours? Or if you want to be more subtle, how about "HI HO AG"? Ag is the chemical symbol for silver.
BTW, one of the best geeky tags that I have seen is one here in Texas that was sported by a network programmer, "XML TAG". I would explain it to you, but then I'd have to kill you.
I tired to find one for my Silver GT also, but everything was taken. I was set on some kind of GIDDYUP or like, but all taken. So was WOAPONY or WHOAPNY which a guy at my work has. I settled on HOOFPWR which the more I look at it, the more I dislike it...