Replace stylus or new cartridge?

Yogi, thanks. It would never have occurred to me that Grado still sell those styli. For many years, the TLZ was my one and only cartridge, and I liked it very much. I still have that cartridge, but when I auditioned it in recent years, the performance seemed to have fallen off. In fact, this is perhaps the only vintage cartridge I own where I can say it may have deteriorated with age. Now I am tempted to spend some bucks to rejuvenate it. The XTZ stylus as I recall is nothing but a selected TLZ. And I am tempted to go for that at some point.

By the way, the Grado, TLZ is yet another bargain, priced moving iron type cartridge. You could say that the TLZ was my gateway to appreciating the potential virtues of moving iron types. As to the question of re-tipping a TLZ versus buying the Nagaoka, MP 200, I can only say that I own a new MP 500, and it is certainly on par with the Grado if not even better. But I have no idea how that compares to the MP 200. One piece of advice to the OP would be to consider spending a little more to get at least to the MP 300 price level. the MP 500 would be the way to go if money is not an object.

@lewm LP GEAR also sells Grado replacements. I've been buying from them for years!

Thanks.
the text of the advertisement on LP gear does suggest that what they are selling is identical to what Grado are selling. And the price is identical, as well.