First of all, welcome you newposter
A Soundgear 300 "needs" to be upgraded, because it has an average electronic (CAP soapbars are not bad at all) but it has to sound thru an agathis body, which can be really poor
A Soundgear 500/600 (mahogany/ash) sounds way better (try it even unplugged and you'll get me...) electronic stay so and so, while Bartolini mk1 are good passive soapbars, but can be retrofitted fine (with Nordstrand for example)
So the point goes:
SR300 should receive some after market attention, SR500/600 are good enough (serious here) as they come out of the box.
PS: are you into King Diamond?