The new Echoflex Tape Echo IS NICE. Try it out in the Custom Shop and you'll see what I mean. Or this video...

https://www.youtube.com/watch?v=IzdajcCAAds

I use the PSP tape echo for my lead guitar tracks. Excellent delay, very analog sounding!

I used to use Kjaerhus a lot.

Fab Timeless... And PSP multi-tap.  But there's a pant load of good delay plugs.

I've been demoing delays all day. So far, they've all been pretty great. For guitar Iks new echoplex is really nice. I'll probably get that in due time. Valhallas ubermod is awesome, but I guess it doesn't sync to host. I was trying to make a template with delay as an effect send. It needs to sync with host. Valhalla may be worth the trouble as much fun as it is. Fab Filter is one I guess I'll download and try. I hate to spend that much money for one plugin though. Their gui is sexy, but I don't think their plugins sound better than everyone else. They have form and function...the best I've seen. I'm not in a hurry. I have several tools to do the job for now. I've got to say Variety of sounds Nasty DLA sounds pretty good to. I'm about to dig out that manual and see if it can sync to host. I had a nice tape delay going with it earlier.

For straight delays, I don't really care. Otherwise I generally just reach for one of my UAD card delays first.
 
But I also like to have a delay set up in an "external" feedback loop so that other processors can be inserted inside the feedback loop. Since Sonar (sadly) doesn't allow you to create such feedback loops by itself, this means I either use NI's (sadly discontinued) Kore2 or create a loop using HW.
 
Much fun can be had by inserting filters, saturators, distortion, etc. inside a delay loop to progressively mutate the delays. On the more mundane side, EQ and chorus work nice too.