I agree with joker, you don't really want to skimp on these bits.
If you get any decent sized grow (I used to pull 23/25oz every 5 months from a 1.2m tent) the smell can be incredible, but also a massive giveaway to what your doing, and if your in the UK, that's still illegal at the moment.
Having the peace of mind over saving a few quid is worth it every time.
As a few have said, a good quality 6" set up will do you fine, just make sure you match the fan speed to the filter capacity and your good.
I use mountain air filters and love them.
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