You can talk with woot about custom donations, there's a chance that you take cash instead of houses (of course you make loss there), If you aren't interested of that you just have to keep looking for some house which you wan't to choose.
Premium vehicles are everything which aren't included in this thread ->
viewtopic.php?f=12&t=61
and you can't pick vehicle which can cause some serious damage (Example: Monster, Hunter, Hydra etc.)
PS. These type of stuff could be asked in "Questions" Section which can be found under community information.
I'll leave this open if you have more questions regarding this subject, if you don't let us know (: