Wool rabbits are best housed on wire floors. They have plenty of wool covering and protecting their feet, plus it is the most sanitary option considering how quickly things get "stuck."
I agree with this, wool rabbits are best suited on a wire flooring.
If you are uncomfortable with the idea of wire due to rumors it would be a good idea to check out this article. It really does tell the truth about wire flooring.
http://rabbitranching.wordpress.com/2013/07/03/the-truth-about-wire-floors/
My Holland lops and Lionheads really do prefer the wire in the caging and hardly go on the nice resting pads I bought them. I have seen my buns actually inch themselves away from the resting mat to be on the wire because they prefer it to the mat. Wire flooring will only cause sore hocks when it is depending on the rabbit themselves, like the rex rabbits are very prone to the wire flooring.
Other reasons can be
Obesity - A rabbit with too much weight on her body will often not be able to stand correctly, and may put unnatural pressure on points of her feet that are not meant to support much weight. This can cause sores.
Arthritis or other skeletal problems - Pain from arthritis in the pelvis or spine--or skeletal pain for any other reason--can cause a rabbit to posture in an unnatural way, resulting in pressure on delicate points of the feet.
Insufficient fur padding on the feet - Any cause of fur loss on the soles of the feet (e.g., mange, friction from improper flooring, contact allergies etc.) will deprive the rabbit of the natural padding she needs to protect her feet. Rabbits have little or no fat padding on the bottoms of their feet; they rely almost exclusively on a thick pad of wool to protect them from impact and friction. (NOTE: Some rabbit breeds, particularly Rex rabbits, have very fine fur that doesn't hold up well to friction. These breeds seem particularly prone to sore hock problems.)
Just remember rabbits can get sore hocks on any type of flooring, I rescued a rabbit running around outside (rex) and it had sore hocks even in a natural environment.
If you still feel uncomfortable that's ok, I just wanted to let you know that wire is NOT bad for rabbits, although some people say it is.