As I have to change my boots since they're just barely big enough, maybe I'll go the route of the socks and rock boots. If there's anyone out there who has changed boots, or boots to socks, would you send me a PM so I can discuss the procedure with you. Thanks.
I've bought 3 suits with attached boots and 1 with attached socks. I had one of the suits with boots changed to having socks. Currently, I have 2 drysuits, once with attached boots and one with attached compressed neoprene socks.
I don't use rock boots with my suit with socks. I use booties. I've tried various scuba wetsuit booties and never found a good fit. Then @tbone1004 clued me into NRS Paddle shoes and I've been using them ever since. They are awesome.
http://www.rei.com/product/881348/nrs-paddle-wetshoes-mens
When you get your boots replaced with socks, I would strongly recommend finding a place that has compressed (or crushed) neoprene socks to put on. When I had a suit where I replaced the boots with socks, the place that did the work only had normal (non-compressed) 5mm neoprene socks. I think compressed is enough better to make sure that's what you get.
I sent my one suit to @Dive Right In Scuba to have the boots replaced with socks. I like DRiS, but if I had to do it again, and they didn't have compressed neoprene socks (which they didn't back then), I would look for another option. Maybe buy the socks elsewhere, try them on at home, to make sure I got the right size for me, and then send the suit with the socks to DRiS to have them do the work.
If you get the right size socks, they'll fit with thick or thin socks underneath, without making uncomfortable wrinkles inside your rock boot or bootie.
Generally, I prefer attached socks for the versatility. I can wear 1 pair of thin wool socks underneath, or 2 pairs of thick wool socks, and either way, the stock still fits snugly, without being too tight, and I get minimal air in my feet, even if I happen to go into a head down trim during a dive.
I do have 1 suit right now with attached "tech boots." But, I bought that suit sort of as a backup, and for use in some fairly specific dive conditions. I wanted it to be as inexpensive and simple as possible, so it has attached boots and no replaceable seals. Just a basic compressed neoprene drysuit, with neoprene seals all around, thigh pockets, and a pee valve, and no other frills. Also, no need to remember to bring booties for it.