Sub $1k reverb

Try the Valhalla DSP plugins that are great. 

I really like rematrix

Hi Schwa.
 
The Valhalla reverbs are great - especially given their price tag. Lexicon PCM Native if you want to spend more money. I really like the full Overloud Breverb as well - amazing control but you have to be willing to spend some time tweaking.

Another Valhalla user (VintageVerb). For convolution I use Liquidsonics Reverberate 2 and when I need/want something huge I tend to go for Stw Audio ReflexPlus 3. I have a bunch of other reverbs but those are my "goto's" and are all very, very affordable.

I got the light version of TSAR for about $20 a few months ago and though it's limited, the algorithm is apparently the same as the flagship version. It sounds amazing, in any case - smooth and lush and lovely. For me it's like Breverb but a bit... nicer. 
 
The offerings from 2C Audio are also gorgeous. Not as affordable as Valhalla which are arguably just as good, but maybe a different flavour. 
 
I also still use IK CSR quite a bit. Sometimes it's got just the right feel and can be made to do interesting creative things - you can use the macros to animate it and get more movement than a static algo or IR can provide... 

I have Reverberate 2 with the Bricasti stereo IRs and I think it does all the big spaces well enough.
Valhalla room is nice too.

Yes, I picked up REmatrix for $99 on a group buy. Nice plug-in. From the man responsible for many of the algorithms in Lexicon hardware reverbs Exponential Audio gets good reviews.

Thanks to everyone for sharing your go tos.  I'm definitely going to check out Valhalla's offerings. 
 
Several of you mentioned the Lexicon PCM Native, and as I looked around on the interwebs, it seemed that many out there think it's one of the best.  "Sounds just like the hardware", which is a good thing - especially since it's the hardware I'd be looking at if I weren't in "sub-$1k" land.
 
The most common complaint was the price.  This package used to be priced pretty high, even the ~$600 street price is more than I would want to spend - too close to to $1k.
 
It seems that Sweetwater has the PCM Reverb Bundle for $299 this month, which is still high for one plug, but comparable to the waves stuff when they're not on sale.  Still, its comfortably sub $1k.
 
I'm thinking about pulling the trigger on the Lexicon, will I need an iLok?  I've heard bad things about iLok over the years, have they worked things out?

Depending on your needs, one may want to investigate ALTIVERB.  Yes an IR based system but the absolute best IRs in the world (you can only use them with AV) and they are part of the system.  You get all the existing and any new IRs that they produce and they have TONS of them and they do sound quite good.
 
Most think that AV is used for VIDEO production spaces but these IRs are also quite musical.  Not only do they have IRs of real spaces (and I mean a ton of real spaces) like studios and concert halls but they have quite a few hardware IRs that are quite good as well.
 
If interested, check out the Audio Ease website for a breakdown of what this system is about.  I love mine even though I have the UA stuff as well.  My goto is probably the UA EMT 140 plate but I also use the real spaces of AE for AIR in mixes.  It works great.
 
Jim

Altiverb is still on my list too. One of those things that I know is great but I can't really justify the high price. Kinda like I had with Melodyne. So maybe Cake can help us get started again :D

 
You don't seem to have a particular taste in reverb (For example, there are those in the "ultra clean" camp, while others like that lush, complex vintage/Lexicon-ish sound). 
 
That being the case, you can't go wrong with the Valhalla bundle, which gives you a nice variety (both clean and vintage are covered) without costing a lot.