It's hard to say without actually seeing the CV's. If you really want to go over 3", you're best bet is to consider a body lift. They're relatively cheap and not too difficult to install. You are definitely safe moving from the 2.5" you're at now to 3". I just wanted to make sure you weren't just getting the new coils for more lift since there are other ways to achieve that (i.e. spacer on top of what you have now, but with the other changes you listed this isn't the option for you).
For what you're wanting, the OME's could be a great setup. Most go with 884's for v6 and 885's for v8 on the front. I *think* you will get close to 3" with either of those (I got right at 3" with 885's on my v8, not 100% sure on the v6 with 884's thought). It wouldn't hurt to get the Toytec 1/4" top plate spacer in addition. People use this to ensure they get a full 3" lift (typically slightly over). My suggestion would be 884's on the front, then add 1/4" spacer (v6) or 1/2" spacer (v8). The 884's will have less preload on the shocks and yield a better ride.
For the rear, I wouldn't suggest the OME's, they're too stiff for a stock weight vehicle. If you're wanting to add a rear bumper or tire carrier, then they would be good. At stock weight, the Toytec Superflex coils are a great choice. OME 895's are 45% stiffer than stock, TT Superflex are 10% stiffer than stock.
An alternative option are the Metal Tech 4x4 coils. These are progressive, which is nice because they can be both soft and firm depending on load. I don't know anyone currently running these on a 4th gen, but on paper they're great. I'm really considering these for the rear of my 4runner.
That said, I would watch the Overland Warehouse threads. It was announced earlier this week that they officially closed the store. They mentioned something about an upcoming sale to get rid of merchandise. I see they still have the 2.0 front kit on their website. You may be able to pick this up for a great price and would be my choice over the 5100/OME setup.
Overland Warehouse Closes - Toyota 120 Platforms Forum