Hey hey, Celes cosplay! We'll have to get together and get some Hellsing cosplay going on.
They both look really good, the two suggestions. I've ordered from Hair Me Now before, and while the quality isn't so great, the cost is good and the sellers are great to work with.
Hitomi's suggestion looks nice too, and you may be able to find a more accurate orangish blonde for Celes. Good luck, can't wait to see your costume!