Any boot feeling "pretty darn good" makes me worry that you are choosing boots for comfort, not for performance, and that you don't know how a bootfitter (a good one) can make a genuinely snug boot feel just fine for all-day skiing with absolutely no pain.
And what you say above confirms that you are looking for a loose fit that feels comfortable.
Unfortunately, this is a mistake. The boots will feel fine in the shop and the first day or so skiing. After that your skis will wobble more than your knees. You may not realize why they wobble. But it will be because of the boots being too loose. If the foot moves around inside the boot, even a tiny bit, that movement translates into ski wobble. The length of the skis exaggerates the amount of wobbly far beyond the tiny movement of the foot.
Maybe you've become used to wobbly skis because your rental boots have always been too loose. And maybe you think it's your newness to skiing that is causing the wobbliness, not the gear. It's more often than not due to poor boot fit.
There's no way you can know what a good fit is unless you have a bootfitter, who you trust, who is willing to try to convince you that a larger size is not required because of swelling feet. And that the boot needs to feel unbelievably snuu-uug on your feet in the shop. And that the boot size needs to be determined by your smaller foot, not your larger foot.
In the end, if you buy boots too big (height, width, and/or length), and you continue to ski, and you continue to find your skis wobbling, you may decide to buy yet another pair of boots that are more snug in order to get those pesky skis to behave. Then you will have bought two pair of boots at those seemingly ridiculous prices, instead of just one pair.
Ask me how I know