I'm looking for a simple, 2.5mm wide solitiare setting (no sidestones) with 6 prongs. I'm being quoted $350 from the local diamond broker I'm dealing with. Does this sound fair or do they generally "throw in" the setting with diamond purchase? Also, the diamond is a "G" color. Should I be OK with platinum or should I go white gold? I saw the comparison at goodoldgold.com and understand the pros/cons...but I understand that sometimes the white gold still has a slight yellowish tent that might lend better to a "G." Comments?