Ah so you're really looking at making a "Utility Stealther" that can also steal Doom arties

Here's what I would do:
1 - Soulstone Lockpicking to a Tmapper, not useful here
2 - Ditch Meditation
3 - Soulstone off Snooping, you only need this if you are stealing from players
The rest of the skills you will use. I agree with Masscre on the Ninjitsu; between Animal Form, Smoke Bombs, Shadow Jump you want to get this skill up. On the Doom arties, you can start stealing them at GM however you will fail A LOT. I would recommend getting the stealing to 120 but only via items as these are valuable points that can be used for your "Utility" role which, to be honest, is MUCH more valuable. You can always throw on Burglar's Bandana, Shadow Dancer's, and even jewelry to get you up there so you really only need a little stealing to be 120 in Doom. You can also do this with Stealth but this is more important when you're doing the "Utility" thing so you don't want to rely solely on items like with Stealing.
With all that said, this is how I run my spawn helper, stealther, utility dudes:
100 Hiding (of course)
100 Stealth (I sometimes go to 120 with items but 100 is sufficient)
100-110 Magery (I like the ability to res, EV's, Invis others, etc. With items minimum of 110)
100-110 Ninjitsu (already discussed)
100 Detect (nothing like running a pentrick Detect script at the alter to reveal other "undesireables")
100 Tracking
60 +/- Stealing depending on items
Rest in whatever you want.
This leaves a lot of room for another skill and moving skills up or down based on items. It is a very handy template to play and can be pretty fun with some Soulstones/SS Fragments. I don't usually put stealing on this template so I've been known to drop Tracking lower then add 100 Necro/SS for total spawn griefing and farming drops, etc. Can be a lot of fun to pull someone else's power scrolls just by virtue of working up the first level or two of the spawn withering, hiding, then stealthing away while they hunt for me. Also good for getting some damage on the champ

The suit is pretty easy/cheap really, other than marties and maybe Shadow Dancers you are looking for nothing more than LRC and Resist. Believe it or not I like using Alchemist's Bauble with this temp (a very underutilized piece of jewelry IMO) but maybe you'll have something you like more. If you go for the spawn griefing route you definitely want as much SDI as possible, otherwise it's pointless.
I raise up Justice on this guy (Using "XIIxOveR's Justice League Red and Blue" of course) so he can do the protecting as well.
I have a number of stealther template flavors depending on the shard and the purpose.
Hope this helps!
XII