Seems you need to figure out what type of units you need and have specification sheets for those trucks from different manufacturers to HELP decide which truck is best for your application first. Weather its the same units you have now, or something better. Clearly you will also nees pricing for these units too, but I would urge you NOT to base everything on price.

Also most companies will ley you "demo" a unit to see if it works in your application.

ForkliftAction.com has a spec checker, perhaps that could help.

Otherwise you will need to contact local dealers to get help with replacement equipment specifications and prices. Also the sales reps will be able to help you analyze your enviroment and suggest equipment that will suit your needs.

Is that the type of info you were looking for?
Hope it helps
Doc.