I am a big fan of Edwinsoft products because they are easy to use and ussually do not need too much updating on your part. You can get article demon for about 100 bucks. http://www.rooster306.com/article-demon If you are looking for something a little more powerful though you could check out ultimate demon. It gives you more features but the price is much higher. Article Marketing Robot is another one. Most experienced affiliate marketers like this one. It is not as user friendly but it gets better results if you don't mind spending a ton of time setting it up and adding sites to it.
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Article submission software will simply get you banned from the search engines. Is spinning your article your only choice? As long as one spins the titles your articles will show. Duplicate content is something that is expected and is seen from site to site. It's the titles that need to differ in order for Google and Yahoo to recognize it as new content. This is a proven method that works everytime.