I have a DSI Color (original) and am thinking about getting some kind of filter for it that will enhance nebulea imaging.

 I have found these 3 filters:

The Orion Skyglow Broadband filter.

The Meade Series 4000 Broadband Nebular Filter # 911B.

IDAS Light Pollution Suppression (LPS) Filters
      LPS-P2-28.6           28.6mm (1-1/4'' eyepiece) LPS filter (formerly part #LPS-P31.7)

Can anyone tell me if these filters are worth it, and if so, can anyone recommend one over the others?

I've used a couple LP filters that remove broad bands in order to relieve the gradients that LP causes in photos, but these filters also remove so much of the green/yellow/orange spectrum as to result in colorcasts.

The IDAS, which seems to be one of the more popular LP filters among active imagers, reduces this effect. Maybe the reduced width of the individual bandstop "cuts", centered on the various lighting emssion lines, is what minimizes the color casting.

I've used nothing but the IDAS for the last couple of years, and it does work well (my LP toward the south is particularly bad, city light dome to SE, neighbor's swimming pool lights to S, and their horse stable light to SW, a real mess w/o filtering) .

Robert

For imaging, the IDAS is the preferred filter. 

 Thank you both for your reply.

The IDAS filter it is!

you may also want to research the astronomik CLS filter before your final decision