Hello and welcome Kirsty and Smartie
Well done for adopting your hammie!!
Well we're new to having Syrians too (although I had them years ago when I was a kid), we too have Robos and Syrians' needs are a tad different to that of Robos or dwarves in general.
We have one Syrian in an Imac Fanstasy and it's a fanatastic sized cage with just the 2 levels but it can also be extended, our Jet seems to enjoy it, however she has taken to chewing the bars (no matter what or how many toys she has) and she's now got a little bald patch on her nose, so for that reason we're changing to a Perfecto Tank.
Our other Syrian Coco, is in a Duna Max Fun, well for the moment (she's also going to be getting a Perfecto Tank), we've removed the wire section that is the middle because of her excessive bar chewing too, so she is now in a basic duna, which at the moment is ok for her as she's so tiny, she still monkey bars across the top of the cage but she doesn't seem to be chewing them. However, with the 3 levels and tubes it gives them a fair bit of room to move around. There are websites on the internet that sell them, I think they are around £50.00, I can't recall the name of the site though.
As for the wheels, again we've managed with the regular silent spinners for the robo's but at the moment, Jet had a Rody Wheel (too noisy) and Coco has a regular silent spinner, which will become too small for her as she grows. However, we've just purchased 2 wodent wheels from
http://www.equinecaninefeline.co.uk these are recommended on here and seem to be an ideal size for Syrians.
Good luck with your search.