Ok - looking at the specs of the equipment you posted:
Grapple - Weight: 700 lbs
Forks - Weight: 420 lbs
And for the KL4010 - Lift Capacity to Full Height at Pivot Pins is 1,835 lbs. (832 kg)
With that Grapple you're losing almost a third of your lift capacity & the forks just under a quarter.
Also, if you plan on working in tight quarters, the 72" wide grapple will be a monster. Think about the area you have to work in & then remember that's going to stick out beyond the sides of your tractor (if I recall the KL4010 sill comes with the same 60" bucket as our KL130)
We have
these 36" forks from Titan (we bought the version that included the hay spear also - if you have no need for a spear, this is a little cheaper)
- Skid Steer hookup
- 3000 lb capacity
- Total weight: 105 lb (frame only) I'm guessing from hefting them on during the initial assembly that the forks add less than 80 Lbs total
They come in at $426.55 Less your 5% first time buyer is $405.22
Grapple width (Wide vs Narrow) and Number of lids has been beat to death over and over again in the Attachments forum & you're welcome to read the debate and decide for yourself, however I would recommend:
50" Compact Tractor Wicked Root Grapple
274 Lbs - $1,492.00
Compact Tractor Single Lid Wicked Root Grapple
54" - 348 Lbs - $1,690.00
72" - 435 Lbs - $1,831.00
Also offer 60" & 66" models as well
Or if you prefer a clam shell design to an L Bottom design
55" Wicked Root Rake Grapple
209 Lbs - $1,595.00
Full disclosure - I have the 50" Compact model and love it. The 55" clam shell style is a new offering that came out long after I purchased my grapple. Given the chance to do over again today I'm on the fence as to which I'd get given my usage.
We bought the forks first thinking we could move "stuff" with them that we couldn't get with the bucket. I tried moving some downed limbs and such with them. The trouble is you have to get them balanced or they won't stay on the forks. If you're cutting the trees into logs then forks might do pretty well but untrimmed trees and brush I think you will become frustrated and work much harder than you have to trying to load & move that with forks alone.
One alternative solution is to get a grapple thumb that goes on the forks to clamp down on stuff.
Pallet Fork Add-A-Grapple - Precision Manufacturing
or simply add one to your loader bucket
http://www.precisionmfg.com/products/add-grapple/single-add-grapple/
In all honesty now that we have the grapple it stays on the loader 90% of the time. About the only time we put the forks on now is during the winter to move a few small round bales of hay for my Uncles.
My advice - go read thru the Grapple threads in the Attachments forum - ask questions - look at the pictures & what tasks folks are doing with them to get a better idea of what you can use them for in your situation.
Best of luck whatever you decide.