how many reverb plugins are you running?
you might want to consider running fewer... like maybe 1-3. that is really all you need unless you are going for something really crazy... can you run 3 reverbs?
1 for vocals, leads (a plateish thing). 2 for "room" (a roomish thing). 3 for "special effects" a sort of snazzy reverb (wildcard... slight gate, some extra delay, someun like that, spring reverb).
send all your lead vocals to 1, background vocals to 2- maybe 1, drums to 2, little bit of the guitars or whatever to 2. anything you want to pop out as a lead you might want to try sending it to 1 to see what happens. to 3 send the snare or something else that you want to pop out... instrumental leads... special vocals all to 3 maybe.
lots of people make the mistake of sticking verbs as inserts on every track... them crazy people. dont be crazy.
if you want to buy an outboard reverb invest in something mechanical like a spring or a plate. a computer doesnt do those that well without really trying hard. good investment... cheap outboard digital reverbs are cool if you pay less than $50 and expect it to be worth $25 in a few years. if you spend $150 on a reverb, expect it to be worth $50-$25 in a few years.
plug ins are nigh free. useum. buy cool microphones.