Hi Adam,
hope you enjoy your trip where-ever you end up.
Theres some good advice about going over to the west coast.
One of the loveliest parts is, as ejn says, the drive from Fort William to Malaig.
If I was to pick an area though, it would be without doubt Inverpolly, north of Ullapool.
As you drive into (Inverpollaidh) its like you've entered another country, or went back in time.  The hills seem ancient and prehistoric, they seem to rise up from the landscape in a way you don't see else where in Scotland.  Theres some wonderful beaches , never mind the spectacular mountains, amazing waterfalls like Corrieshalloch and Ullapool makes a great base with plenty of accomodation , pubs restaraunts etc.
http://www.renderosity.com/mod/gallery/index.php?image_id=1513726&member

A walk up Stac Pollaidh is a real treat, if you've a head for heights, and the Ben Mor Cogaich ridge is also fabulous.
Try this site for easily the best information available for hillwalking in Scotland.
http://www.scottishhills.com/html/index.php

I've done over half the Monroes and been up the likes of the Cobbler at Arrochar almost 40 times, its something that just keeps pulling you back for more, but Inverpollaidh just has to be seen. If you do get the chance don't miss it.
Theres loads more scotland shots on my RR gallery, or on my website.
http://aangusphotography.com/

Expect midgies too.
They're why walking is so popular in Scotland, coz as soon as you stop they're at you!
Look forward to seeing you pictures.
Anthony