"...very seasoned beekeepers" hope they don't use too much salt in that seasoning... ;)
"...advice on ordering supplies for the first 2 hives in Spring". Starter kits do typically, if not always = waste of money. These are the first two hives ever or just two additional hives planned for Spring? There's lots of great resources (this forum, books, other beeks, etc.,) for starter shopping lists: hive bodies, SBB, covers, frames, suit/veil/gloves, tool, smoker (cigar idea is awesome, heh!) with lots of options. When I was making my list and deciding on which it was a one component at a time evaluation (e.g. deeps or meds for brood chambers, what type of foundation, etc., etc.,) in order to ensure I was getting the best solution/set-up. It may have made it a wee bit more involved but I've found it best to know as much as you can prior to making purchases (& beeking isn't really that complicated).
Best of success to you and enjoy yourself!!