Cineform Neoscene and Cineform NeoHD - which one would be more appropriate for my workflow and why do we need them to begin with?

I am using HDV (Canon XH A1 and Sony FX1) and AVCHD (Panasonic HS100) to shoot video with. The end result becomes commercials or TV shows for broadcast in most situations. Sometimes the output becomes video for multimedia or games.

I also score music to video on another machine. So, do I need a cineform product, first of all? I thought one came with Vegas, but I have never really had any luck using it (or finding it, for that matter).

I mostly capture to m2t files (and now avchd) and edit those, along with captured footage, when necessary, from the BetaCamSP deck through a Blackmagic Designs Multibridge Pro and also from any user footage we do not capture and must deal with.

Usually I render to quicktime uncompressed or motion-jpg. How would Cineform help me.

I have noticed that I have a really hard time displaying the preview smoothly despite the Multibridge Pro (using an HDMI plasma display) - it's usually chunky and not smooth. Would converting to Cineform format make all of that smoother? We mostly edit in and output to either 720x486 4:3 or 720p. We stay in 1920x1080 when possible and render down from there.

Thank you for your help. It's very confusing.

Mike