This is the best sounding reverb plugin I've ever used. There is also a professional version. I recommend starting with the regular version and seeing if you need more before getting the professional version. The normal version reminds me of the Kurzweil Rumour.
Simple. Sounds fabulous. It is a very high quality reverb. According to Liquid Sonics, 30 of the Bricasti M7’s finest ever reverbs are including in the Seventh Heaven. You need an iLok 2 or iLok 3 unfortunately. If you do not have an iLok I suggest getting the iLok 3.
Reverb No. 2: H-Reverb Hybrid Reverb
Holy hell this is a full featured reverb. No iLok. Usually on sale for less than $50. I like who these reverb literally makes drums breathe.
In using reverbs, remember that presets tend to make everything "wet." You normally need to dial in the sound to get a balance of dry and wet. Also, do not forget EQ. The Seventh Heaven has an easy control for rolling off the low or high end. Do a search online for "Abbey Road reverb trick." Learn it.
If you need more reverbs than these two plus the stock reverbs in your DAW, then nothing likely will ever cut it with you.