Thanks again for all your input. When I got there, they had the Samsung Amp prime on sale for $70 less than what I was willing to pay, so I purchased it. Since I was porting from AT&T, I couldn't get the extra $30 off, but still the phone was just $80.
I asked about the HTC Desire 520 and the guy told me they come with a boat load of bloat ware so that drove me away from the only HTC that I would purchase from them.
So far, I am quite happy with my upgrade. The amp prime is very responsive, has 16 GB of ROM with 1.5 GB of RAM, has an SDHC card slot and a 5" AMOLED screen (whatever that means) that is very vivid. I'm hoping to keep this phone for at least 3+ years and when I need to upgrade again, I will do better research to include HTC, Moto and LG phones.