Thanks for all the comments. After sleeping on the order for the 24x40, Im starting to consider a switch to the 20x42 model so the counterweight wouldnt be an issue. Im not crazy about the design on the 20 but it has everything the 24 has, no tuning plates to hassle with, better table and would save me about a grand. Ill probably never need the capacity in all honestly. Im torn and have been reading through old threads about these models. Someone convince me one way or the other.
I was in the exact same position as you when I purchased my offset. Here are some points to think about in no particular order. Only you can decide what makes the most sense for you!
1) 24x40 looks cooler plain and simple.
2) 24x40 requires a counterweight (in my mind)
3) 24x40 costs over $1k more
4) 24x40 has larger fire box side cooking surface area
4) 20x42 is simpler to operate with no tuning plates
5) 20x42 is easier to clean with no tuning plates
6) 20x42 is smaller but unless doing a LOT of bbq it's plenty big
7) 20x42 requires slightly smaller splits. I usually cut my logs in half, may not half to as often with larger firebox.
8) 20x42 has much nicer table
9) 20x42 will heat up a bit quicker and require less wood to maintain (I wouldn't let this factor alone sway me)
11) 24x40 may have a bit more space above the upper rack.
Whichever one you go with, do yourself a favor and buy the fire management basket. As Speeed noted, it makes life SO much easier.