Unfortunately, it must be a Siberian. Siberians are the only cats I've never had an allergic reaction too, all others give me itchy eyes, a runny nose etc 
Doesn't have to be a kitten, though.
I wondered if that might be playing a part in your decision. As others have said there are no guarantees; living with a cat surrounded by their fur and dander week in week out is very different to visiting with one ... it would be heart-rending to give up a cat you adore.
I work in healthcare and my whole family have allergies, all my experience says that allergic responses frequently progress from one substance to a similar one. A cat could easily live for twenty years, that is a long time to expect your immune system not to realise that Siberian dander is as 'dangerous' as any other cat dander.
Might we suggest you look to foster first, with a view to possibly adopting if you can resolve the allergy issue? There is anecdotal evidence that raw feeding helps reduce allergens in a cat as the skin is an organ of excretion. There are also some who swear by Petal Cleanse which I believe you apply to the cat, so that is two avenues to explore.
You might speak with your GP as there are desensitisation treatments available, tho this cannot be done whilst you live with a cat. There are also steroid injections that last a couple of months (ideal for hayfever season), tho there are side-effects so I doubt your GP would want to give these long term. Lastly you might look at your own nutrition - for example omega-3 (from oily fish) for example is a powerful anti-inflammatory; by contrast sugar and high glycaemic index carbohydrates have proven inflammatory effects. This is of course a long term commitment and far more complex than I have outlined here.
