We had this problem (actually we installed a clawfoot tub thinking it would be cheaper than installing an enclosure, etc) and ended buying the cheapest option, right around $200 as you mention. Don't do that to yourself. The cheapest option is not worth the cost - our curtain rod often came apart, the water pressure was junk, etc. If I could do it over again I would do as Greg suggests and piece it together using heavy duty plumbing parts and make a "look" of it.
Also, plumbing materials are not cheap in general, so I wouldn't be surprised if you end up paying ~$200 to piece something together. Doing it right is well worth it over time.