Socks may not seem it but is a huge and convoluted subject. Was a big chunk of footwear fitting training when training up my staff.
Different things fork on different feet and with different boots. One thing that makes me wonder with 1000 mile socks is how they feel they can guarantee good fit when socks should be an integrated part of your whole footwear. That's why a decent boot fitter will want to to bring your socks, or get the socks while in the shop when fitting boots.
A lot of folk recommend wearing at least two pairs of socks; this does give extra padding/warmth, but can lead to slippage between the differing socks and cause blisters.
I must admit to having a preference for good merino socks, I find their moisture management (another source of softened skin that rubs) very good.
You mention that you have painful feet and fallen arches. This will exacerbate problems as the feet will extend and contract with the action of walking. Properly fitted boots and possibly some form of extra or custom footbed would probably be in order. John Fenna did a good review of Superfeet recently
HERE though personally after training and fitting various types of footbeds over the years I find the
Sidas Conformable one better for a wider range of problems.
To be honest I could type for pages on the subject, but the best bit of advice would be to find a good honest outdoor shop and ask to speak to their footwear specialist. Take your boots and current socks along (they can tell loads by wear patterns) and they should be looking at how you move and looking at your bare feet. It may sound a faff, but blistered and sore feet rob you of the enjoyment of being out and can be dangerous as it takes your mind off of where you are going. Most good outdoor shops should have a specialist and not charge you for having a fitting with them. Also if you can make an appointment for later in the day when your feet have swollen up and are tired all the better as this helps show up problems.