Regarding choirs: IMO, the EastWest choirs are somewhat outdated for today's standards. Several newer products by other companies sound way more detailed and realistic, and some of them do have good word builder functionality if you're willing to spend some more money. A GREAT tip if you're looking for really good sound (great recordings and very nice true legato) at a super-fair price, and can live without a word builder, would be Soundiron's Olympus Elements. And you can upgrade to their "big" Olympus library that also includes a word builder later.
I personally wouldn't go with the old EWQL orchestral library any more. It's actually kind of abandoned by EW. They sell it, but they're not putting any kind of development or support work into it any more. I think that not even the affordable price is really an argument, as EW constantly hawk their "current" (and better) orchestral libraries (the Hollywood series) for very little money. They have quite aggressive sales all the time, one just has to wait and keep their eyes open.
The dreaded PLAY engine is always a risk factor, and while some of the sounds of the old EWQL are still quite nice (some of the strings and the percussion), the library is quite outdated in some aspects. The woodwinds for example just don't cut it, and I really think that VSL woodwinds are the best thing you can get, period. It's really a whole different league. The old EWQL stuff also doesn't have any "true" legato, which I really value having, and is again something that IMO VSL is unparalleled at.
I think the VSL Special Edition + MIRx is the best, most value-for-money full orchestral collection right now. It's not the "newest" collection of samples either, but it's impressive how gracefully they have aged. I guess it's this very detailed, down-to-earth and "realistic" recordings that make these samples so timeless. Trends come an go, and perhaps something that sounds really contemporary and "epic" today, will be perceived as dated 10 years from now. But a VSL oboe simply sounds like an oboe, and the programming is still just top-notch. And it's still a living product - they come up with new stuff like MIRx, VI Pro is being updated, etc., which keeps breathing new life into the library.
In the end it's all subjective of course, and I can only concur with DaddyO's closing statement. Do your research, avoid jumping the gun with sample libraries, be very clear about your needs, and if you can actually try stuff out somewhere, that would be really really valuable and helpful.