As above, BKR7EIX seem to work well, but be aware they don't last as long as the VW ones because only the electrode is iridium coated, not the ground strap. OEM NGKs use platinum on both the electrode and the ground strap, so last twice as long.
Standard air filter is fine, or chuck a Pipercross dry foam filter in if you want a little more air flow. They're only £30 or something.
If you want a bit more oomph past 5000rpm, consider an aftermarket intake kit.