I'd get the maintenance kit, stand along bobbin winder (thread, bobbins and needles are most likely cheaper to get somewhere else).
I'd check out the optional light kit, I added lights to my HQ and really like them. I'd also check out what the cutting mat is. I put cutting mats all along the back edge of mine, and that gives me a 12' long cutting surface. I use it for trimming quilts after they are quilted so I can put on the binding.
And the Micro handles, I leave mine on all the time, just rotate them out of the way.
There are a lot of other items people have mentioned that I agree with - but they are not shown on your list of options. - extra feet, ruler base, front winder wheel (if your frame does not come with one), extra bobbin case (in case you drop one and knock it out of round).
The other thing that HQ now has is a support so you can lift the top (quilt top) rail out of the way when positioning batting.