I have infiltrated my track lights with LED's. First, they can be found fairly cheaply on eBay by buying directly from the suppliers in China. I have found them all to be good to deal with, very reasonable if not free shipping, and fast shipping. They can be communicated with with usually decent English.
I would definitely recommend the warm whites, Even these are a bit off color from incandescents or halogens. I have done this in sections with my wall displays. The sections do not abut each other so you don't really see the difference side by side. At first the color difference bothered me (as change tends to bother most of us), but I really don't notice it now.
Definitely get dimmable. You can keep them on an un-dimmable switch, but then you always have a dimmable option.
The floods are more directed than conventional bulbs, but due to the low power consumption you have many more placement options.
The LED's keep the power consumption lower. I have about 40 fixtures so power consumption can matter. Also, you don't have to be so concerned about over loading you wall switches (regular or dimmers).
On the layout I have mostly gone to the LED' with a few incandescents left for color balance in a few spots. I now have a small fortune in conventional bulbs left over, so I am still burning a few of them.
I too do not like that they only dim to about 30%, but, again, I've gotten use to it. My layout lighting can still be seen, and they do maintain the ability to be turned off.
This has been my experience,
Alan