I had a few LXP-1's and 5's in my racks for a while. They are decent sounding reverbs, but they tend to lack a bit in the "depth" and "spacial" departments. They are good sounding units for the money though. Once you add the remote to them they are much more versatile as well. As far as the Alesis stuff, I have had too many Midi, micro and quadraverbs over the years for my taste. At least the Midi verb and Micorverbs seemed to be pretty durable, but the Q2's and Q20's had bunches of problems. In addition to that, "lush and dense with smooth tails" is exactly the opposite of how I would describe them. What I did like about them though was the gated verbs and the vocal doubler preset.
For not too much money,
the TC Electronics M-1 does a decent job. The M3000 also does pretty well, but the more expensive
M4000 (I beleive this is the model number, but I am referring to the 2 channel version based on the M6000) sounds great. There really seems to be a big jump in 3D imaging and a naturalness to the sound of this unit form the ones below it. Sadly though the price hops up there a lot as well. Used M5000's in many various configurations can be had pretty affordably these days (like $1500 for a 4 channel one that may even have digital I/O as well).
Yamaha actually makes some nice verbs in my opinion in the SPX line. I personally like
the SPX 900, 990, 1000, and 2000. The presets are decent but just a little tweaking of a couple parameters and the yamaha starts to sound pretty nice. Used 900 and 990's cost about $300-$450 a unit and used 1000's go for around $500 or so now.
The spx 2000 is around a grand new.
The spx 1000 and 2000 have the rev-x algorithms which really sound pretty darned good.
As far as Eventide goes, of all the hardware units I have owned, I like my Eclipse the best. The Eclipse is an amazing and flexible unit for it's price, but not for someone that is not willing to spend quite a bit of time familiarizing yourself with it and going through the 2 inch thick manual in a binder they send. There are more than 300 presets to start with and most of those are very odd ones. Once you learn how to properly build an effect in the Eclipse though it opens a whole new world of smooth and spacy verbs that I have never found in a box like that. As for the metallic impulses, I would imagine that the impulses were created by someone who just transfered the stock presets and may not have picked smoother ones.