Hi all - new member so be a little gentle !!

bit undecided here as have a limited budget of $3 to $3.5 K to play with so could use some friendly but sage advice

strictly amateur to date and main interest is wildlife photography Aus and Africa ( not much into birds ) but do a bit of landscape, golf courses and general walk around also

if you check my gear list below you will see my current lenses are 3 x EFS and 4 x EF with 2 x 100 - 400's and my cameras are a 7d and a 600d (t3i) so ok gear for what i do

i like having AF capability and prefer to have it but i want higher ISO because i shoot off hand a lot using Tv- hence tempted by the 5 d 111 and its AF capability with f8 (with centre point) for use with either of my 100 - 400 with a C 1.4 Ext attached to get some reach out there ( and from what i read appears not much difference in quality between a 100 - 400 with 1.4 ext and the tam 150 - 600 out there at the 550 / 600 setting )

the other option is the 6 d (great at high iso) but not so good with moving AF and it wont AF at f8 ( so why not fix both issues canon with a firmware upgrade hey !) and add a tamron 150 - 600 to get AF and that longer reach out there

still toying with the idea of waiting a bit longer for the 7 d mk 11 (if it ever comes out) and see what it might be like at a higher iso (say 1600 + would be great ) with either my 100 - 400 / 1.4 E or perhaps the tam 150 - 600 , but and of course cant afford a canon 500 or the amazing 200 - 400 which is what i would really like - although do fly a bit and big heavy lenses can be a pita .

any helpful advice greatly appreciated !!
cheers rob
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GEAR LIST :- 7D; 600D; SX50 HS + EFS 10-22; 18-200; 55-250 & EF 24-105 f4 L; 70-200 f4 L; 100-400 f4.5/5.6 L x 2 ; + 1.4 MK11 Ext & 1.4 Mk 111 Ext

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OPPS Sorry heading should read :- BUY 5 D 111 or 6 D WITH TAMRON 150 - 600

cheer rob