RF connectors manufacturers: Quality/Price comparison

Hi friends! I would like to hear your experiences about quality of rf connectors. I have used huber-suhner's connectors up to now. Nowadays, I m looking for cheaper ones those are good enough for my experimental works. I use pcb or cable type sma connectors most and frequency range is 100MHz-4GHz.
First, what are the common problems for low quality connectors? Impedance, insertion loss... mechanical problems?
Anybody who uses Deltarf, Pasternack or Multicomp's rf connectors?
Suggestions, comments will be welcome, thanks.

Since your freq is only 4G, there should have no problem for low quality connectors.