I agree with Neesie and Roserips! There is no need to stitch in the ditch on your quilt, and if you do, then you certainly don't need to do other quilting after you've done that.
I, too, am a straight line quilter, mostly, and like Neesie, I love the look of stitching 1/4" away from the seam line. Depending on how much I want to accent each section, I might just stitch to one side, either inside or out; or I might stitch both inside and out. I also align the outside of my presser foot with the seam and use that as my stitching guide.
For your quilt and pattern, I like the idea of doing the diagonal X thru each block as described by roserips. That is an attractive and easy straight line pattern that will highlight your pattern.