Hello regularjoe,
I too am a lefty!
Just a few thoughts!
1) The Remington 700 SPS youth model comes with a spacer that can be installed between the recoil pad & stock to accommodate the shooter as he/she gets bigger.
2) Remington 700 BDL walnut stocks are fairly easy to find (even left hand ones!) and can be installed along with the mag box & hinged floorplate assembly to "upgrade" an SPS into a BDL.
I have a .243 Winchester set up like this and it consistently shoots 1" groups with no issues whatsoever!
FOR THE RECORD - I currently own 2 Remington 700's and have owned 4 others over the last 40 years. I have been directly involved with well over a dozen other Remington 700's owned by friends and family members. None of these Remingtons have ever had any of the issues that I have read about recently.
3) The Browning X-Bolt Micro Midas is undoubtedly a "prettier" rifle and, if it shoots half as well as my A-Bolt Micro Hunter (left hand 270 WSM), it should be a great shooter as well!
4) The last Savage I owned was a piece of, , , , well, that was a long time ago. I have read some very positive things about them in the last few years but I have no first hand experience with them!
Let us know what you decide and how it works out for you.