A lot of you aren't getting the point of the thread... It's about what exactly you would invest in, not just "services or a program"
I invested my hard earned money in outsourcing. I have let them use free tools as well like easyarticlespinner.net The income in return is good. Although sometimes we have to spend om subscriptions as well like comment kahuna.
I definitely agree that SEnuke is a must have tool for SEO, it saves so much time! Just make sure you get the discount at www.senukediscount.net its only $67 for the first 37 days