I finally bought my 4" 617 9/08, picking it over the 5" 63 & 3" HiViz 317K at the time. It would quickly get some Ahrends retro targets with a homebrew oil finish on the raw cocobolo as well as a trigger job and a HiViz front sight. Great shooter!
I made the right decision, as I found out nearly a year later when I bought a friend's new 5" 63 from his estate. I had no intention of working the 5" 63 over - but it sure needed it. It needed a larger grip, so I put the square conversion Hogue rubber monogrips on it - fair fit to my medium+ hands. The 63's lockwork inproved with a little cleanup and spring changes to about what the 617 was post break-in (Pree spring change there!). The 617 is now, of course, a tad lighter in DA.
Shooting with the 617 is interesting - the 4" balances quite well - and permits rapid hits on target. The 63, if it just had better wood grips, and maybe there will be some Hogue wood monogrips in it's future, thank you Raveneap, to assist there, would be an ideal 'extension of your hand'. My remembrance of the 6" 617 with OEM Hogues was of a muzzle heavy revolver. I theink the 5" 63 would feel more natural.
Both need sight help for me, black on blach not being my favorite sight picture. The HiViz helps that 4" 617 be a quick target acquisition revolver, the 63's black/black needing more time for my 'mature' eyes to acquire. I may need another HiViz...
The DS-10 Speedloader speedloaders are nice - quite an interesting addition. I have the 6 x 10 plate for my 617 and the 4 x 8 plate for my 63. Fun adjunct for either revolver - especially for plinking.
The J-frame needs a lighter (9 lb) hammer coil and a lighter rebound coil (13 lb for mine) as well just to be decently functional. My 617 got a similar rebound and a full strength Wolff hammer leaf, which is a bit lighter than than the OEM leaf, yet yields no ftf's. As to ammo, I use the WalMart 550 packs of Federal 36gr plated HPs - el-cheapos. Some would say that's like serving cheap beer in champagne glasses... phooey to them! They do produce odd fliers... and that is a heck of a convenient excuse for less than stellar marksmanship!
I'm thinking the 5" 63 - if you can find someone to 'clean it up' and put some lighter Wolff springs in it, may be ideal for you. Mine is way too much fun to ever lose. In fact, the 3" 63 announced as new this year may just be my 2010 purchase!
Stainz