The all solid 214s had forward shifted bracing, solid lining for the kerfing and a thin satin finish. The ones I've played had great projection with strong fundamentals, but not quite as much tonal complexity as the 314. The 214 was more 'straight-up'.
I would do a search on sold items on eBay and look on some websites for used gear (GC, for example). Check the pictures to see that the guitar has black binding and a satin finish top (03-06 are the ones with solid Sapele back and sides). White binding is used on the 07-current 200s with laminate Rosewood back and sides.
I think you'll find the range is right around what the advertised price is for a new GS Mini.