You might consider a convolution or IR reverb plugin. You can get all those options and more in a pretty usable package for a lot less money.
The problem with just getting one "flavor" of reverb, is you only have one "flavor" to work with. So it may be great for one source in a given song, but be absolutely horrible on many others. So room may work great for drums on one song, but not for vocals. Then plate may be awesome on a particular vocal, but not another. It'd be a bit like trying to make a painting with just one color. You can do it, sure, but unless that's the point of the painting, it's not gonna look right.
Hence my recommendation for an IR reverb plugin. You can buy one of them (I bought TL Space used off a eBay for cheap!) and then download a bunch of Impulse Responses for free from all over the net and have access to tons of different types of reverbs. They may not sound as nice as the Lexicon PCM reverb plugin, but I bet they'd work better for you as a whole than just one reverb flavor would, no matter what the quality of it was. Also, I downloaded a PCM 60 IR that I found off the internet. It's not a tweakable in IR form as the real thing, and it probably doesn't sound as nice, but spending $1k or more on a plugin just isn't an option for me. I've got to eat, man!