the Cricket trolley from them uses resin, so would be expensive if your in a hard water area, thus they are right in saying you should go for the more expensive system ( 2 K
)
if i was spending that much, i would personally build my own and then spend the change on a nice holiday
http://www.d.co.uk/oh i did make my own
But we have all heard the ionics systems are top notch, oh just so i dont seem to be sideing with them, i also like the Onmi systems who are well worth a look at the site they have
but back to reality, DIY makes sence for a trolley system