To check Google PR:
http://Google-pagerank.net
getting back to topic..
It's hard to say Robson, some PR 5 have less than 100 uniques per day
so paying $ 25 for that would be a waste.
however if there's a good combo of unique hits and PR..that would be great!
off topic:
PR isn't everything though...i just had my less than 1 month old site receive a PR 4,
which was shocking,but it did receive 500 uniques per day..
lol