If you have anything other than mild allergies, then I'd rethink
this.  At least you're not getting a cat despite the allergies of
a spouse or child.  That kind of thing is so self-centered, yet
it's seen all the time.

You might find these links helpful.

http://www.messybeast.com/allergy.htm

http://www.futurepet.com/cat_allergy.htm

This won't help you determine how effective the products are, but
it's a start.  Check www.epinions.com and you may find opinions
about the products there.

It might help too if you cleaned your monitor...

http://www.legrady.hu/sc.html

I have minor allergies, and have two cats at home.  I also have two cats at
work, so I'm around them all day.  If I'm bitten or scratched I'll have a
reaction (hives, my skin will start itching) but it goes away in a short
time.  Today at work I was kissing one of the cats and my lip puffed up, and
that hasn't gone down yet but it's not bothering me.

I have had serious reactions to other people's cats in the past.  My 12 year
old nephew can't step foot into my apartment, but he's usually okay with his
cat at home.  You may find that some cats cause more of a reaction than
others.  You could always get one of those really ugly hairless (Sphinx?)
cats.

--
Liz

I posted this sometime ago and notice how it worked with one of my dogs:
(from:
http://www2.niaid.nih.gov/Newsroom/FocusOn/Asthma01/research.htm#dna )

Cats May Protect Against Asthma

Contrary to popular belief, high levels of cat allergen in the home can
sometimes decrease the risk of a child developing asthma, says grantee
Thomas A. Platts-Mills, M.D., Ph.D., of the University of Virginia.
Apparently, the presence of a cat can alter the immune system in a manner
similar to allergy shots, he reports.

For other allergens that trigger asthma, such as the dust mite and
cockroach, the higher the exposure level, the more likely it is that a child
will produce "allergic" antibodies, called immunoglobulin-E or Ig-E
antibodies, against them. This high exposure increases the child's risk of
becoming allergic and developing asthma.

But with cats, high exposure actually can confer protection -- at least in
some children, Dr. Platts-Mills says. He and colleagues measured the levels
of allergic antibodies to cat allergen in 226 children, aged 12 to 14 years,
and tested the children for asthma. They also measured the amount of cat
allergen in the children's homes and discovered that low-to-moderate amounts
of cat allergen seemed to trigger allergy, but high amounts -- greater than
20 micrograms per gram of house dust -- reduced both IgE antibodies and the
likelihood of asthma.

"This result alters the advice we give patients," says Dr. Platts-Mills. "I
would not recommend that all parents get rid of their cat because they are
concerned their child might develop asthma. High exposure to cat allergen
appears to be protective for some children and a risk factor for others. If
the child is wheezing and has a positive skin test to cat allergen, then you
should get rid of your cat."

The high levels of cat allergen prompted the children's immune systems to
make mostly a particular subtype of immunoglobulin G (IgG), called IgG4
antibody, rather than IgE, Dr. Platts-Mills explains. Allergy shots are
believed to produce a similar effect. "This research sheds more light on the
relationship between allergen exposure and asthma," he says. "When we
further understand this process, it might lead to new treatments for
asthma."

Reference: T Platts-Mills et al. Sensitisation, asthma, and a modified Th2
response in children exposed to cat allergen: a populations-based
cross-sectional study. The Lancet 357:752-56 (2001).

(from:
http://www2.niaid.nih.gov/Newsroom/FocusOn/Asthma01/research.htm#dna )