teratec ex 1200 is the best value for money 70 quid delivered to your door {charterhouse aquatics online} it performs as good as any of the others for less money, crystal clear water with no algae.
But they dont have the proven reliability of Ehiems, which for a tank of that size i would definitely want.
i have been running the tetratec ex 1200 for a while now on a fully stocked 300 ltr coldwater tank, 2x7inch weather loaches, 2x9inch comets, 3x 8inch shubs, 2x5inch golden sucker loaches and it performs absolutely amazing, quiet, powerful and crystal clear water, as i said you will not find a better filter for 70 quid.