Unless you plan on getting into reloading anytime soon, I'd stay away from 10mm anything. Around here, the ammo is tough to find and when you do, it will empty your wallet faster than a teenie bopper at the mall.
Do rent before you buy, if possible. In addition to the GP100, try out a 586/686. Like me, you may find it balances in your hand more to your liking. But as nice as the L Frame Smith (I do love my 686) and GP100 are, I wouldn't want to tote either of those pigs around CCW for long. Like others said, it won't be long before you buy more toys for your collection
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For a do everything well gun, I'd also keep my eyes open for a nice used K Frame Smith. If you are going to CCW and hunt with the same gun, a 3" K Frame may be a good compromise. With 357 ammo, stick to 158 grain stuff and higher to avoid cracking the forcing cone, the only weakness of the K Frame. Check you state's regs on handgun hunting however. A 3" Ruger SP101 would also be a top pick.
Then there are the used Rugers like the Security Six. Every bit as tough as the newer GP100, but not as bulky. To me anyway, it is superior when compared to the GP, but that's just my opinion.
Enjoy your search, and welcome to THR! Your gonna like it here.