I have tried SEPowerSuite and I worked good, but once the trial expired I have removed it. Now I'm about to purchase the full version.
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The problem with most SEO tool (based on my experience) is that they sometimes leave footprints. and your site have some risk of being penalized. I suggest you purchased a VPN or proxies when you use one..
Most SEO software is garbage created by morons. I love to watch Andrew Hansen rip apart some of that junk on his blog. (But at the same time, I don't buy anything he's selling.) I'm amazed that people buy stuff from those long 1-page "sites" that look like they were created by partially-illiterate used car salesmen from 1975.
Link-assistant can be useful, and I prefer the Mac version.