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I gotta vote for Stevie's Number One; there just isn't anything like it, really... except for maybe Rory's un-burst Strat.
These fiddles were played and loved nearly to death, and the customizing that occured over the years was mostly done out of keepin' 'em goin', -with a little vanity mixed in (the "SRV" stickers), but still, it was mostly about continued function... like duct-tape and baling wire kind of changes. -Motel room surgeries.
Anyway, the unique-ness of instruments that emerges like that is always admirable and beautifully ugly in a way that only other players (in most cases) can truly appreciate. There are a bunch of instruments that fit this catagory, i.e.: Clapton's Blackie, Willie's Trigger, Sheehan's Wife, just to name a few, but I think the SRV #1 is the most recognizable.
-My huge opinion.