The best replacement for wpa is wpa2.

The best alternatives to wpa are rated as following:
★★★★★  wpa2
★★★★★  wep
★★  wpa-psk
★★  wep security
★★  wpa psk
★★  wps
★  wep encryption
★  wpe
★  wpa2 security
★  wpa2 speed
★  wpa/wpa2
★  wep key
★  wep speed
  wpa personal
  wep better
  pwa
  ccc
  wpa2 wep
  wolf ammo
  wpa2 personal
  radius
  wpa2 wireless security
  wpa2-psk
  wep which is better
  wep wpa2
  wpa2 encryption
  wpa wpa2
  wp2
  tulammo
  802.1x
  wpa2 psk
  wep security wireless
  wpa2 which is more secure
  psk
  wpa2 difference
  wep wireless security
  web
  psk2
  bupa
  802.11i

Your alternative for wpa is not listed? Suggest!
Speaking about wpa, one probably shouldn't forget about aircrack.

Other search terms related to wpa and their ratings are:
★★★★★ aircrack
★★★ tkip
★★★ wds
★★ wps
★★ nintendo ds
★ ds
★ kismac
You have in mind a companion for wpa and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of wpa in all years. Click on graph for more.
wpa
wpa2
wep