I completely agree with Mr. Character, why just buy one part when you can just go for the whole enchilada?
I tried two Blackburn leadpipes for my P.O.C. strad, the 19-348 and the 20. The 19 is much easier to play on, but seemed to sacrifice tone slightly, while the 20 improved tone greatly, but took some getting used to. Both improved intonation and slotting (slightly), and really changed the properties of the strad. Of course, I'm wanting a non-jazz horn. Just explain to them what you want and they'll try and explain what each leadpipe does. You could also check out blackburn.com and see each leadpipe description.
If you call them and ask about their leadpipes, they do offer a free two week trial of any leadpipes you want to try (Need a credit card, and you have to pay for shipping both ways). The pipes also come in polished brass, so if you do decide to use it as the replacement part, it will look a bit strange (some people like that, though. Brings attention to the fact its a different part on the horn).
As I said earlier though, you may just decide to go on ahead and get a new horn. However, if you only have a couple of hundred dollars on hand, and you don't foresee winning the lottery any time soon
, a new leadpipe from Blackburn is $175, their tuning slide is $300, and their bells are $900 (The thing Blackburn promotes the most about their horn is their bells, which contains tin in the normal brass mixture. They say it produces a sparkle in the sound, but I haven't tried them.....Yet. I just have to get up to patience to endure the three hour drive through hills and valleys and Deliverence-esque scenery to their workshop!)