Whenever I gas for a toy, musical or otherwise, my wife (bless her heart) tells me to go ahead and buy a decent one so that I won't be wanting another one in a year.
She is always right about everything, so I have developed an alternate recommendation for you - get a decent 6 string, at the (high) quality level of your 5 strings, and make a commitment to it. You certainly know that there will be some transition period, and my thought is that if you feel some sense of ownership, you will try harder, get up the learning curve, and be able to truly determine if a 6 string is your thing. If, on the other hand, you cheap out, and you don't like your experience, you will never know whether it was because a 6 is not your thing, or that the 6 you had was inferior to your other instruments so you naturally liked it less.
Having said all this, I might suggest that a Yamaha TRB6 is a high quality, mid-priced instrument, although large-bodied and heavy. That might be a good try.
As for the Musicians' Friend discussion, two wrongs don't make a right IMO.