Looks pretty tall, not that that's necessarily bad, just a matter of taste.
Just seems pricey to me. You might find a good range here: http://www.kultofathena.com/helmets.asp
The makers are listed, so you can check if they're any good, but I'd say the only things to be too concerned about are - what's the steel thickness, are they badly riveted?
There's a couple of GDFB helms there, which are what a lot of ours are, and they're pretty good, they hold up to our treatment of stuff, anyway. I wouldn't recommend anything that isn't made from steel by them though, it's mostly cotton crap, so anyone that overuses GDFB is gonna stand out a mile. A couple of our guys have boots by them and they fall apart pretty easily.
Cleaning: Scrub rust off if it forms, I'd recommend a plastic or cotton scouring pad, try and keep an oily layer over your helmet after you've handled it, though, and rust shouldn't be an issue. I use WD-40 for pretty much any cleaning needs, but you can use other oils.