the pppoe dictates nat? didn't know that. as far as I know it's just for auth purposes.
now, the ISP might require certain type of connection. like in finland we had a ISP that required a routed (non-bridged) connection for home user connections. the bizz connections didn't have that requirement but the price went up ten fold 
it's been few years since I was installing connections myself so can't say I'm on top of the game anymore. but from stability and cheapness perspective telewell was the choice as backup always carry on device. was the cheapest and provided really good flexibility. and if it didn't work it didn't hurt moneywise to swap it.
oh, and I think Billion was the other brand.
just checked on one finnish site and the cheapest vdsl2 device you can get is a zyxel:
http://www.verkkokauppa.com/fi/product/4...porttinen-VDSL2
which has pppoe support. and it doesn't have wireless like the 5 euros more expensive telewell. and that is a good thing.
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