personnly went for fluval, as thats all i've used, and they've done great. they keep getting slagged off, but i dont see why. and given that XP3s are more expensive than 405s i'll go with fluval anyday.
but if the eheim externals are as good as the internals(tried the eheim aquaball, fluval4+, 2 different interpet filters, superfish, the aquaball is by far the best filter, fluvals good but i have to net it when remooving it as it drops a lot of cr@p) i would go for them, their not cheap though... especially as a large proportion of the time the media isnt included.