Having spent so much time lately in the "Swords for Home Defense" thread, I'm a little leery of the term "real combat"
When you say that, do you mean Competitive Live Steel, or are you talking about a real "self-defense weapon?"
If you're talking about competition stuff, let me recommend
http://www.by-the-sword.com
They have a decent selection of "beater" rapiers, some decent small swords, foils, and epee blades.
They also offer replacement blades sold seperately, and if you're a "heavy user" like myself, you can expect their rapier blades to last a year or more before needing replacement. If you manage to get one that breaks prematurely, (it happens) By the Sword has an excellent and highly forgiving return policy. I've never had a problem with a return and exchange from them. Very polite and very prompt.
For higher quality rapiers, try
http://www.darkwoodarmory.com
They use the excellent Del Tin Blades and custom build the hilt for you. Either assembling it to your requirements or building from scratch to your specs. (costs a LOT more!)
They also have EXCELLENT quality and service, but there is often a waiting list to get your sword.
They will also fit schlager blades to their rapier hilts if you desire a more historically correct appearance. (To my thinking, this just makes for a light blade rapier with poor balance, but that's IMHO.)
Some might say to try Museum Replicas,
http://store.museumreplicas.com
but they are only slightly above the By the Sword offerings in quality, but nearly as expensive as Darkwood.
I provide the link so that you can decide for yourself.
HTH!
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Tráceme no sin la razón, envoltura mi no sin honor
Usual Suspect
MOLON LABE!