ADSL modem router to connect home to office

Trying to figure out the most suitable unit to allow me to connect to
the office's network via its Draytek Vigor 2600. This has been
configured for VPN connection & three colleagues already connect using
ADSL modems.

I need a router as I will be connecting from a desktop & a notebook.

I've been told by two potential suppliers that I need to buy a Vigor
2600+. This is £40 more than the base model - 2500 that has a
pass-thru VPN i.e. I need the 2600+ because it has VPN termination.
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Peter Langley