Stupid question - anyone compare Blog Comment Demon, CommentHut and Scrapebox?

I blog comment as part of my linking strategy, and it works or I wouldn't bother - but I need a better way to find blogs with DoFollow and higher PR.

Currently I simply use Google Advanced search queries, or use the "Blogs" feature in the sidebar in Google, coupled with SEOQuake to find higher PR blogs (though I comment on pages with no PageRank for G.P.).

Or, I'll use "Keyword"+"KeywordLuv enabled" or a number of other search strings...

If it sounds like a lot of work, it ain't...until you do it repeatedly...then it's just mind-numbing.

Anyhow: Blog Comment Demon by Edwinsoft, CommentHut by Paul Forcey or Scrapebox - these are my choices as I see it. All three seem to work great - and yes, I know about Comment Kahuna but it won't work on my system for some ridiculous reason.

I don't plan on using any tool to comment spam, I just want a URL harvester with PageRank, and DoFollow or NoFollow indicators...so those are the three I'm considering.

Price is not the main issue (I can get SB for $57 like the next guy) - my main issue is: which is the best buy?

(I already think it's ScrapeBox, but hoping someone's used the other tools and can weigh in.)

That's it. My silly question. Thanks.