Here's a list that ranks directories by their price against PR and Alexa rating. It's a good starting point to find directories if you want to spend money on a listing.
At least go with one that has a stable history and even check domain name expiration date. Many submitters prefer ones that have a submission/review fee vs. outright paying or bidding. The trouble with the newer bidding and paid directories is you never know when one of them might go away or get punished. The Big 'G' can change a formula and overnight your PR3 link is sitting at PR0. John
Yeah thats a great resource as I am also considering for paying for a FEW and with all the options out there its great to be able to narrow down the "better" ones.