In reply to Matty_W:
There is so much good walking in the area, it is hard to choose!
Suilven is a fine peak, though the walk in and out takes longer than the actual climb if not doing the eastern tops (which have some tricky exposed scrambling). Personally, I prefer Quinag, Cul Mor and the round of Beinn Mor Coigach from Culnacraig (do all 7 tops for maximum enjoyment: any scrambling is readily avoidable), but all the Assynt/Coigach peaks are very worthwhile.
An Teallach is a very fine mountain - the full traverse has some hard scrambling, but this can be avoided, or you can get to both main summits as a out-and-back from Dundonnell.
Worth considering a route in the Fannaichs - there are 3 popular circuits, all good, though the scenery is perhaps less special than the west coast hills.
Lots more at https://www.walkhighlands.co.uk/ullapool/