While Eheim may tend to be a little more pricey then some of the other cannisters on the market they also tend to be of higher quality. This point could be argued till the cows come home, I don't think I am leading you down a garden path in saying that its comparing apples to oranges to put the Eheim up against some of the "stuff" that paraded across vendors shelves. Stating this may put me between a rock and hard place, but I stand my cliche ridden ground and proclaim Eheim as cream of the crop.
I never thought that those green tubes were Ehiem parts, I always think of as they were c02 injectors. Now I know that they are Ehiem parts for Ehiem canister filters, it makes me want to get an Ehiem Canister Filter.
The last Eheim 2028 that I bought came with the new generation spray bar and intake tube. They are a nice transparent grey color and blend right in. The really great thing with them is that they have hinged joints which makes it much easier to place them in yor tank for nice clean lines. Nice!
You can buy them alone now in some of the catalogs like Foster and Smith, if anyone is interested.