I too plan on more raised beds. I really like the ones here
http://www.tomatoville.com/showthrea...ht=texas+cages
I originally did mine like the SFG. 4 x 4 then 8 x 4 and lastly 12 x 4. I think I will try 12 x 2. Just enough room to fit the Texas Cages.
I used for the most part redwood. Some I used that Trex (?) decking material. I was buying so much wood that the manager asked me what I was using it for. He ended up selling the pieces that were not "perfect", which is fine by me for $5.00. So you may want to ask about that. It was Lowe's. Not sure about Home Depot. They will cut it for you for free. I am far from handy but I was able to drill and screw them together. I hired help to prepare the ground and to bring in the soil.
I personally did not like railroad ties. The ones they have here had stuff oozing from them. I think cedar is a good choice too. GL
Nancy