I have this one
http://www.amazon.com/Himalayan-Institute-Press-Netipot-Ceramic/dp/B00027Z41G
This is a good neti pot. I like it because of its shape.

Although, I do not use it much anymore. I use this instead:

http://www.amazon.com/Grossan-Hydro-Irrigation-System-Original/dp/B000H84D2G

I do not see where it matters. Before I had a neti pot I used a squirt bottle. As long as the spout delivers water up your nose, you could use a rubber hose you're too young for that reference (Vinnie Barbarino)

I have used a fancy metallic pot from Kerala India and I have used a small plastic one which I actually prefer and use now for ease, mixing, cleaning and travel.

Even though it seems cheap you need not purchase solution as a pinch or three of salt with sodium bicarb is all that is needed.

Aye