The Dp's also have an extra wall Ive heard.. They are double walled rims compared to the velos which are singles? anyone that can confirm this? At any rate, I had a set of Dps and then sold them for a set of custom built velo deep v up front, and a cadence niobium 30 deep v out back with double butted spokes, and as for riding on the street.. the difference is minimal. Ive had seams on both types fall apart/come seperated.. but the spoke tenstion has held everything together nicely, but if things were to get worse Id replace it asap.
edit: save the cash, buy dps if you want that deep look or find a nice box profile rim like the sun m13.