Fabt - 8:57 am on Feb 23, 2012 (gmt 0)
i hate to say this as i am against paid links:
if you expect to get qualified traffic from that directory then it won't matter. But according to my experience, by directory you are probably referring to a site that is pretty much made up of links, no original content, and no valuable traffic; so if you're going to PAY for a link, you might as well contact a trusted site/blog to ask for a link or pay for one-this type of link would probably give you a much higher boost in rankings that that link filled directory.
Don't recommend this in long term as the money you spend could be better invested in strategies that would automatically list you on such sites