First the easy answer. Revolver grips are easily changed, so grip size shouldn't be too critical. Frame size is. Also a round grip frame hides better than a square gip frame.
My High Standard still has the wooden target grips on it. Target grips have more girth and are not made to hide under your shirt. They are wider at the bottom and will "print". This is my "field" gun, so I haven't yet changed them. They look like the pair that is mounted on this D.W.
Dan Wesson 357 Mag Pistol Pack 8" 6" 4" & 2 1/2" : Revolvers at GunBroker.com
My 2 1/2 in. bbl D.W. has Pachmayr Gripper Grips grips.
Pachmayr® Pachmayr your primary source for quality handgun grips and recoil pads They are rubber with finger grooves, palm swell, and are relieved for a speed loader on the Left side. The rubber being over the backstrap reduces felt recoil, especially when shooting 357 magnums. (38's are a pussycat) Dan Wessons don't have the usual grip frame, just a stud to mount the grip. The 714-2 was my Every Day Companion before I got the Taurus m605 and my Bersa BT380.
The D.W. model 15-2 (6 inch) is my favorite shooter. It's a range gun for me, but I have a box of "Bear" loads (gators too)...just in case. I have the Hogue mono grip on it. That grip has an even softer rubber than the Pachmayer for more recoil absorption, has a longer grip angle, is relieved for a speed loader, and has finger grooves. It has a "tacky" feel, so it will catch on a cover garment, but I like it because my handgrip is less apt to move because of sweating.
Dan Wesson Small Frame Rubber Monogrip [57000] - $24.95 : Hogue Inc., The Best Value In Handgun Grips, Rifle Stocks and Accessories - Bar None!
#2) The "7" in the Dan Wesson model number designates the Stainlees Steel frame, that's all. ie 722 = S.S. frame 22lr, 714-2 = S.S. .357 mag, 744 = S.S. 44 magnum, etc.
#3) The hard part....price. Dan Wesson Revolvers have become a "cult" gun. There's always someone willing to pay too much, or start a "Reserve" very high so the prices run accordingly. Remember that they are of top quality, on a par with the legendary Colt Python, but with a more sturdy trigger mechanism than the Pythons are known for. Check Auction Arms and Gun Broker to get an idea of the current prices.
Seeing as you want a BUG/ nightstand gun in .38 Special, I'd say check into the used market. If you need to use it, the police will most likely take it for evidence. There's a bunch of Smith & Wesson model 10's, model 12's and Taurus model 82's in 38 Special floating around and you might find one at a decent price. I always figure in shipping, transfer fee ($25), and a trip to my gunsmith as part of the price. ($40 Bench fee)
Buying a used handgun scares some people, but you just need to know what to look / look out for. Here's an article by Chuck Hawks about that. Scroll about half way down for wheel guns.
Buying a Used Handgun Print it out to take to the gun store or Pawn Shop when searching.
Is you head spinning, yet? lol