I'd say qualifying for AO '08 is his best result (that and reaching the final of the Waikoloa Challenger in '07). He's finally reached the top 200 with this win, anyway
You're right, playing Grand Slams is bigger than this. Also his Wimbledon WCs.
But still it's nice to win a Tour-level event in your own country (even if it's not Scotland
). I'm happy for him, but Top 200 is not where he belongs IMO.