I just purchased a Marmot Sharp Point...
I just purchased a Marmot Sharp Point Softshell. I live in Dallas and I am wondering whether I would have better off with a lighter weight jacket,
Hard to say, but the Sharp Point is a pretty burly softshell. You might do well with lighter powershield jacket (something like an Arcteryx gamma mx or gamma ar, etc...) or I would strongly recommend looking at a Marmot Driclime windjacket (I think the catalyst is the newest version). It won't be as water-resistant as the Sharp Point, but it is windproof, very light and very breathable. You can also look around for lightweight windstopper shells which will be more water resistant, although powershield is generally a good compromise of windproof (blocks ~90%), water-resistant and breathable. Good luck!