I have several Photoflex umbrellas and highly recommend them. Top quality and affordable. I recently started using the 60" White Convertible (RUT60) without the black backing as a shoot-through. It's very soft. I used to think 60" was too big, not I wish I had started with this umbrella.
For radio triggers, I like the CowboyStudio NPT-04. For $23 on Amazon, they're cheap and reliable.
Photoflex makes a good multi-bracket (AC-BSWCP). SP Studio and Impact have near identical version that are cheaper and of similar quality.
A nifty adapter for using up to three flash units on that 60" umbrella is the Interfit Tri Shoe Adapter.
http://www.bhphotovideo.com/c/product/742155-REG/Interfit_STR141_Tri_Shoe_Adapter.html
Lastly, the Yongnuo YN-460-ii is a great manual, off-camera flash for about $45.