cage toppers are safe (if you make them with mesh beware of sharp corners and edges of the mesh, as mesh can prick!!) especially if you have a *diggy* type ham lol
$80... what is that about £60 ??
is it a zoozone 1 or 2 ? and yeah they're definitly suitable for syrians!!
i am going to mesh my future (dont ask me when lol...) maxi mulys (identical to the zozones) with zip ties and mesh, yeah. its the easiest way. of course you could reinforce it with wire tied around the mesh and actual bars - i think i'm going to do that
in the long run i think a zoozone would be better, as although its expensive its a really great cage and its not so heavey. but then tanks and toppers are a good idea to...
just personally i'd say zoozone
goodluck x