Great blues have been played on many different types of guitars of all ranges of price. Archtop, dreads, grand concerts, resonators, prob even nylon strings.
My experience is that the best blues are defined by the player. Like this:
http://www.youtube.com/watch?v=iFymnrJSe8k
Buy what you like and then study from the best. YMMV
hans
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1971 Papazian (swiss spruce/braz RW)
1987 Lowden L32p (sitka/ind RW)
1992 Froggy Bottom F (19th cent. german spruce/koa)
2000 Froggy Bottom H12c (adir/ind RW)
2016 Froggy Bottom K mod (adir/madrose; my son's)
2010 Voyage-Air VAOM-2C
http://www.soundclick.com/hanstunes (recorded on Froggy H12c)