I love these ideas, but I think the

1-15
16-31
32-47
48-55
56-66
71-75
76-80

idea should be altered a little.. it would be unfair for a l12 pvper for example, to have around 20k kills in pvp and but a l15 which kills much easier, has around 30k kills.

It should be different, depending on the intervals of each active pvp level. for example,

L1 pvp

2 - 3

4 - 7

8 - 9

10 - 12

12 - 14

14 - 17

17 - 20

20 - 24

and so on...

I think making it more direct will make players choose proper pvp levels.