I was recently in your place so I might be able to add some perspective.
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Scalloped vs. serrated front strap, long or short trigger, etc. Any tips on how to figure things out?
I guess that is a matter of personal taste/phyisology. For instance if you have short stubby fingers a long trigger may feel very uncomfortable in your hand. No matter how much you research you do (I did a ton before hand) chance are there will be something you wish you had done differently. If you chose to build another one somewhere down the line apply the lessons learned and hopefully you get it exactly right.
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One thing I really need help deciding on is whether to keep the original barrel or replace it. I don't know, it just seems wrong to spend +$1200 customizing a gun, but keep the original barrel. But on the other hand I bet the accuracy of the original barrel is just fine for me. The barrels only got 300 rounds through it.
That is a very personal choice one often influenced dircetly by the cost of having a match barrel fit. The Barsto run $200 and the Kart's run $120 (give or take a couple dollars), then you have the labor of having the barrel properly fit. If $250-300 on top of the other work done isn't an issue go for it.
In my case money was a consideration but not the over riding one. My factory barrel was plenty accurate as it was. I just had a match bushing installed and the barrel recrowned and the gun clearly shoots better than I can. If it really bothers me down the road I guess I can always opt to have one installed. Another option is to have an accuracy job performed on your stock barrel. The cost of that ususally falls in between the two other options cost wise.
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I'd also try out various competitions IDPA, IPSC, bullseye, etc. But I see myself most likely just getting into IDPA.
If you are interested in IDPA make sure that you get a barrel with a standard bushing. All other barrels (if they are longer than 4.2 inches) are illegal (ie Bull and Cone barrels). Also bare in mind that action work might make the gun illegal in bullseye shooting. IIRC there is a 4 pound minimum. I am sure someone here knows the exact rule.
Finally, listen to your smith's advice. They know what does and doesn't work well. If you are going to trust them enough to do $1500 of work hopefully you would trust them enough to give you good adivce. Also enjoy the process the wait can be painful but the reward is always worth it.