Hi Chris
Tools are a very personal thing, so you'll get different opinions on what's best. Make sure that ALL tools are capable of taking the pressure generated by a T/M pump. Some are only suitable for use with a lower powered portable. Go for a 2" tubed wand (1.75" would be OK) but 1.5" is a "toy" for porty use

If your marketplace is primarily commercial, you may wish to consider a 14" wand, otherwise 12" should be fine. I was suitably impressed by the Greenhorn wands down at HydraMaster, but as I say, it's a personal thing.
I'd have thought 200ft would be the minimum length of hose required for a T/M, but stand to be corrected. Obviously 2" vac hose, but make sure you use the 3000psi rated solution hose.
2" vac hose tends to be quite stiff and cumbersome. I would recommend at least one length of 50' from a certain Bodmin, Cornwall company as it's much more pliable than most, then the rest you can buy regular stuff from whoever you choose. I like orange colour hose to run across the path as it's more visible to the visually negligent pedestrians.
Safe and happy cleaning

Ken
PS I'm glad to see that Michael finally got rid of that pile of krap

PPS Only joking
