"I'm concerned about replacement bulbs/elements so will be asking about that before giving final approval of the LED fixtures that have been suggested."
In general with today's LED offerings this isn't a concern, you are quite likely to scrap the fixture before the LED module fails. I realize that many people are paranoid due to the early failures we saw with CFL's but LED's just don't see the degradation due to power cycles as the CFL's did. Relax they will last. I do suggest with buying the good name brand products though, like Philips or Cree. The off brand or re-branded stuff sold under names like Sylvania or Lights of America worries me a little more.
If you are still concerned then be sure to buy cans that use a standard medium base reflector style lamp, for these you will be able to get LED's lamps for the foreseeable future. Even with a good brand name fixture like say a Halo, a unitized LED can fixture is unlikely to have a replaceable module. They are engineered to have a ~20 year lifespan so don't count on replacement parts.
I have two 6" cans in one bathroom and I have 14w LED R30 replacements in them. The lamps flush out with with the circular trims and they look awesome, both physically and the light quality they give. I haven't touched those lights in 4 years now, not sure I will ever need to again.
