1. I REALLY
hate the sound I currently get from my bridge pickup, in fact I avoid using it as much as I can (I've been playing a lot of Slash stuff
). Apart from being thin, it is too damn shrill and nasal-sounding
! I've read that the JB sounds too shrill n bright at times too. It wouldn't make sense getting another pickup that sounds similar right?
2. I'm not looking forward to changing my neck pickup, I'm going to keep the stock one. I really like the sound I get from it, and don't want to fix what's not broken. Is changing just one pickup recommended?
1. I'm not sure how "shrill" your pickup sounds, but I've never had any problem with JB so far. I had my first JB installed in my $100 I believe JB was more expensive than my guitar
plywood guitar 20 yrs ago. Now I have GMW custom built in 2001 which also has JB. I don't think JB 20 yrs ago and manufactured these days sound the same since SD must have corrected errors for a long time, but I found JB as very warm and prefer Duncan to DiMarzio or EMG for some reason. So JB is not shrill for me
but if you're worried about the sound before installing, adding some good active circuit would be a good idea so its tone can change in wider range than passive. Duncan sells some preamp eq circuits as well as other companies.
2. Yeah, sometimes it can cause some problem. some of PUs have different level of output from other PUs, so the level difference between Neck and Bridge PUs could be prominent. Normally it can be fixed by adding a proper resistance to the stronger one, but there's some case that doesn't work. I have a Fender copy which has a Fender original for the neck and DiMarzio for the bridge. I originally wanted to install Bartolini on the bridge side, but level difference was so huge. My friend, a guitar tech, said it's just easier to install DiMarzio.
And by looking at your guitar from the link you provided, their PUs must be some mid range product. Even if you like the sound of your neck PU at this moment, JB's sound quality should stand out coampred to your stock PU.
if you feel it's a bit expensive to buy two Duncan, I recommend Tesla pickups. It's a relatively new Korean brand grown a lot for the past 10 yrs. They don't have a variety range of products like Duncan or DiMarzio, but some of their products sound almost as good as US brands. And they should be a little cheaper. Check the youtube for their sounds.
Good luck to your upgrade!