There is no such thing as "the best modems". It very much depends on what kit is installed at the exchange end.
In particular the huge focus in these forums on the Broadcom chip benefits is mainly to do with O2 and Be LLU, where Broadcom exchange equipment is used, and O2/Be use a setting on that which can improve performance if the user modem also has Broadcom.
What does the Bipac have? In fact what does the Draytek have? I confess I don't know.
Re the Broadcom 6358, that is quite rare except in the current expensive models. As far as I know the only significant difference from the very common 6348 is that the chipset supports wireless N, whilst the 6348 does not. As you aren't fussed about wireless I suggest you consider either.
So to answer your question, the SpeedTouch 585v6 and v7 are Broadcom 6348 based and seem to me to connect a few hundred kbps faster than the Netgears I'm about to list. However they aren't too good at handling noisy lines and can often overheat, causing trouble. The overheating is easily cured by propping one side up 1"/2.5cm to create a throughflow of air.
Netgears, the version number is very important. All the following are 834 models but only the versions I give (if I give a version) have Broadcom:-
834v4, 834Gv4, 834GT, 834PN, 834Nv1. The first of those does not have wireless, the rest do. Netgears are best stood on end - many have small detachable feet to do that. Possibly another heat problem and I would expect the ones without wireless to suffer less.
Those are 6348 chipsets apart from the 834Nv1 which is 6358.
There is also the later DGN2200. I think that is 6358 not 6348, as it supports wireless N.
Avoid 834v5, 834Gv5 and 834Nv2. Those are Conexant and seem to be poor on any connection.
834 and 834G v1,v2 and v3 are Texas Instruments AR7 chipsets and have a decent reputation, just not as good as Broadcom on O2/Be.
I suggest the place to look is on eBay. I believe there are a lot of Sky-badged 834s there. Those need unlocking to use them on other providers, but that seems to be easy enough, although I don't know how myself. Browse/ask around on these forums.
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Edited by RobertoS (Sun 22-May-11 09:15:26)