It will be difficult to get a designer enclosure for that budget. All the ones I found for that budget did look like a brick.
Will the 3500 work at its potential in an external enlosure anyway?
ie, is firewire fastenough for 16x burns?
I put a 8x drive in a firewire enclosure ands it took 2 minutes longer to write discs compared with when it was installed as an internal drive