Should I choose an RE investment company or find an agent

[Frandy Ho]

This is my first posting and I am interest in purchasing an investment property- Single Family Home in Texas. Dallas, Austin & San Antonio are my potential area. 

I found 2 investment companies in Texas online, AREI (American Real Estate Investment) & Home Union that help investor like me to purchase rental property in Dallas &San Antonio area. It looks like both companies are buying low cost properties in volume, Rehab and resale. They provide details of each property with an estimate return of net 6%. I need someone has experience with these companies give me some feedback. Are they reliable source or I should look for a RE agent instead.

I also contacted a RE broker referred by a friend who has investment property in Austin but he only sell &  buy Austin.  When I ask him about rehab property, his feed back was the market is too hot today,finding an undervalue property is unrealistic.  He emailed me a listing that listed properties sold to support his statement.  But I went to zillow and found a foreclosure property listed at 88K. I don't know he is the right agent I should hire.

I am looking into an 8%net. Is this a realistic No in Texas?