GB&A are an okay brand. As long as the guitar is in good condition, thats deffinitely a nice guitar for a beginner, but I've seen better specced washburns going for only a few thousand higher(12,000) and you get decent jackson, aria etc for around the same price.
I'd recomend going to a store and comparing the guitars to the one hes offering. IMO at 19000 for the GB&A, he either got ripped off or is lying to you(I could be wrong though).
As for other brands, jackson, B.C.Rich, Washburn, Aria(to some extent) are all good and then you get epiphones, squires and LTDs all for pretty reasonable prices(I saw an anarchy washburn with 24 frets, dual humbuckers and a tremelo for 12,000 in bharat music store). If you plan to try satch, see if you can get a unit with a tremelo arm.
Putting the PRO and FAN in PROFANITY
-Agile Intrepid 8 String
-Kramer Striker 7 string FR
-B.C.Rich Afterburner SE Warlock w/ Seymour Duncan Blackouts
-Bassmaster 200W amp