The only new 700 I’ve handled that I would buy without hesitation is the 700LTR but it’s hands down a better rifle than your off the shelf SPS, every 700SPS I’ve held felt gritty when the action was cycled but LTR was smooth as silk.
Good choice on the Howa, I wasn’t too hot on the Nikko either and swapped it out. It wasn’t terrible and it now sits on another rifle that only sees range use, the 4-16 was too large and just more mag than I wanted for hunting plus the mildot reticle wasn’t what I was interested in using. I put a 2.5-10x40 on it, perfect all around size for me.
I thought the Legacy mag kit looked cheap at first but I’ve had zero issues with them, 100% feeding and mine isn’t loose once inserted. I have a 5 and two 10 round mags, they all function great, I prefer the plastic mag due to less weight when loaded then a metal mag would be. The only thing I’d change with the mag kit is the release, I’d like to see it on the rear of the magwell and not the front. Less chance it will get caught on something but my mags have a bit of friction while inserted so loosing one isn’t a concern form me.