definally wet to straight they are very good straightners and are very affordable. make sure you use leave in conditioner whenever using any heat on your hair this will protect it alot!
Whirlpool seems to be the best inexpensive air filter to buy, but there are many other inexpensive ones out there. In addition, it depends on what one considers to be "cheap" to accurately asses this...
Roper is manufactured by GE. Not the best but will do the job accordingly. For the money being spent it is a pretty good buy as far as reliability goes.