Keep the current SSD as a cache for the HDD. No need to ditch either of them, even if you do decide to get a bigger SSD as a boot drive. I don't think I'd recommend a Crucial V4, it's pretty slow. Their m4 is faster, but still pretty affordable. The Samsung 840 is another good option; faster, but not with the same proven reliability (it's fairly new, but Samsung drives are usually great).
Your brand choices are fine in general. If you want to stay with OCZ for the PSU, I'd recommend the ZT series. Modular and good quality; the ModXStream line is borderline quality and the ZS line is full wired.