I'm confused... you have a 12 and 8 year old, they should fit in the back seats. So what is the necessity for a 3rd row? Are you guys expecting another baby or planning on another one?
My .02 is that the third row is extremely limiting... When the 3rd row is up you lose a lot of storage space, and there is almost ZERO leg room with those seats up. They are really designed for petite people or kids that have out grown car seats but are not going through a growth spurt.
I mean... to me it doesn't sound like you NEED a 3rd row, and if you want the amenities of the LE but the price of an SR5 you may want to consider a Trail Edition. The Trail has the softex, nav, and "goodies" but you wont get 3rd row. The TE also is 2x4 with the lever for 4x4 while the LE is only 4x4 or 2x4.
At the end of the day it's all about cost or compromise. Are you willing to compromise wants vs cost, being money for something else (date night, eating out with the kids, changing brand names to store brand, etc) to cut cost and put it toward a higher monthly payment, or are you going to compromise on what you want in your vehicle and get the base model.
Last I checked on USAA a new Trail Edition premium was running about $32 out the door, fully loaded, not including tax, tag, title.