Okay I didn't read all the post so if I'm repeating something someone else said please forgive me.
My thought is that obviously you already have a machine and any machine you could get at Walmart, (or Target, JoAnn's, Hancocks, etc.) for $200 or less probably will not do more than the machine you already have.
I would save for one with a bigger area to the right of the needle. I have my eye on a PQ1500s by Brother.
http://www.allbrands.com/products/abp01065.html