IMO the RC-3 is about one of the best all around EDC knives that can be had. It pairs up with the RC-6 brilliantly. The RC-6 is a bit of a brute, but capable of doing the brutish things without giving you arthritis of the left hip. The RC-3 does everything it is a PITA to do the RC-6 with. I love the combination of the two.
That is exactly why I started out with the Ontario RAT-7 and RAT-3. Every thing you just stated above is exactly how I see the both of them as well.
Now I have the RC-3 and will eventually get the RC-6 for the same reasons I obtained the two Ontarios. I want to support RAT Cutlery in general.
The grip on a knife means a lot to me and I don't mean to slam the Becker Line of knives. They hold an edge extremely well and they are really easy to sharpen. I had a Becker-7 and the Becker Necker. The Becker-7 always felt like it was going to get away from me, like I was on the brink of not being able to control it well because of the grip. Like the Glock 21 (.45 ACP), the Becker-7 is a great knife as the G21 is a handgun, but the grip on both of them are too large for my hands and knives are a lot like guns in this instance - you should get something that you can control or you will get mixed results and possibly not be as safe as you could be with the tool.
I haven't had the pleasure of an izula yet. It looks like a great little knife, like all neckers, optimized for concealed carry and minimal weight when used under neck carry. I like the neck carry mode, but find I only use it under certain circumstances, like when I'm sitting in a boat. I tend to prefer scales on my knives. However, I do see the Izula as one of those perfect Kit knives to stow in a PSK.
If I know I am going to be using a small knife around camp a lot, I might carry it using neck-carry. However, for banging around all over the place, I don't like neck carry for obvious reasons. I don't mind having a small knife like the Becker Necker or an Izula with a skeltonized handle/grip. On a larger knife, I wouldn't like it at all.
I think the Izula is the perfect survival kit knife, especially the Maxpedition Versipac sized types of PSK kits or the Maxpedition water bottle survival kit Tony has, etc. Anything larger than that and you can carry the larger RAT knives.
It fits in the back of the Tactical Tailor E & E Pouch diagonally without a problem. It won't fit in a Penrith Tin, but you can't have everything! That T.T. E & E Pouch is an excellent piece of gear. Terry ("TJT" on here) gave me one for Christmas a little bit early so I have had some time to play around with it a bit. I have the M1 and M2 pouches from Maxpedition but for our purposes and my own personal tastes, I think that pouch from Tactical Tailor is an awesome platform to design a belt pouch PSK that is not so large it becomes cumbersome, etc.