LG CU515

if its PTT that you are interested in then you might want to go ahead and remove the KRZR from your list (if you use at&t that is). the lg 515 has a dedicated PTT button, the nokia does not. i have not used these two phones personally, but i do like the look and feel of the lg over the nokia, and i'm a nokia fan. the 6555 does have a better display @ 16.7M colors over 65K, and if you want to get into the internet, the LG is faster w/ HSDPA 3.6 over the Nokia w/ UMTS. its ur call buddy, but i would go with the LG for PTT and 3G