TW is stat dependant. If rolling stats and you have two that very high, a TWF is easier to accomplish. One high stat go with the THF. There is no way around it. With the point method set your dex high enough to get the two weapon feats with level based stat adjustments when they are available and dump into strength with the rest. This will make your con lower but with armor training the added AC from dex should make up the difference.
If the number of feats is the issue simply spend one on a double weapon. Since crtical hits is where you make up the majority of your damage make sure you use a high threat range weapon, making two-bladed sword you best choice. DM generosity will always play a big part. Burst weapons, strength items, and mithril weapons will help. You may also ask him about creating a double scimitar using craft weapon skill that you can pay to enhance. Spend feats on master craftsman and craft magic arms and armor and enhance it yourself.