About GPs.... You can never have too much.

For HW collectables 650 GPs is ideal. I don't know if you can reach that at L 51 even with pentamelding and food. I do know there is a L 51 gathering set. Just for reference, I'm L70, BIS, almost fully pentamelded, can get to 750 GPs easily enough with food, and want to get to 800....

Also Chysahl Greens are collectable. Coerthas Western Highlands, 8:AM & PM.