Alesis Wedge...$150 US or less (discontinued, btw)...all the time at Ebay.com. By far and away the most adjustable reverb in the sub $500 range and it sounds great. I'd be skeptical of those that can hear any defects in the sound when combined in the mix with a couple of other reverbs. Not to mention a 2min decay time if you should be intereted!! Plenty of other effects too, but the reverbs are the prominant items in the Wedge. A hidden jewel, in my opinion. Much better than Alesis' rack mount versions. I have a half dozen of different cheap(and/or inexpensive) rack mount units (MPX100, ARTfxr, Alesis variety...)and two Wedges. I always use the Wedges first.