Your local group is
http://www.envedette.orgIf you are interested in Dutch Hussars, they are your best way forward. They also have links with the current regiment which if I remember right is run by Harry Kampen who used to run the 14eme Cuirassier back in the day.
If you are interested in a British unit, then you may want to steer clear of the heavies.
The heavies had specific lace which has to be ordered as a bespoke batch unless you know someone who can weave it for you. (if you are looking at teh 1812 uniform, and bearing in mind we have Waterloo bicentenary coming up in 2015 just over the border from you) The helmet is a pig as well.
Pre 1812 the heavies may be easier as the lace is plain.
The most dificult part with the hussar dress is the barrel sash Shakos and busbies are relatively simple.
Pre 1812 light dragoons are not too bad, but the tarleton can be tricky to source.
I had a couple from Solent Saddlery/Cavalry Workshop that really didn;t cut the mustard as the level of detail isvery poor for the price (wrong colour metalwork, bearsking crest just folded over carry mat with was bolted on to the skull with inch proud bolt ends protruding in to the skull, and wrong general construction of the skull. I found a better supplier is
Hussar Saddlery in the states who cost half the price
But I would work out what you want to do and for what reason before you invest in anything inorder to maximise the use you can get out of what you buy.
We have a British Light Dragoon in Holland who is not invited to the dutch Cavalry events because he does not do Dutch cavalry.