I cannot answer your question, but I can throw a couple of thoughts out there as I was thinking of making a speaker upgrade myself last spring (and I actually did buy a new pair).
The Revel 226 and the Forte IVs seem to be similar in thhe floor space they take up.
The sensitivities are quite different, so I suppose alot of what you decide to do may be predicated on what amp you are going to use.
As far as price and dealers, due to another thread I was following I did some looking at the Revel 226 and I did see that MD had two pair that were both marked down, one pair was marked all the way down to 4k. Which looked like a pretty good deal. But then I saw that both Uncle Kevin and Crutchfield are selling them for 4k. I believe that all three of these dealers offer an audition period; MDs is 60 days, and I am not positive about Kevin and Crutchfield, but it would be easy to find out.
The speakers I actually bought from MD last spring were the smaller Revels (126be) that were marked down (which had a lot to do with my purchase) to 3k. But then I saw that for quite a while Uncle Kevin was selling them for 3k also. Anyway, after reading up on the Revel 226, I was kind of wishing that the 226s were up for 4k when I bought my 126s, as footprint wise, there really is not a whole lot of difference, and with the two woofers per speaker, the 226 should be a lot more speaker(s) for another 1K?
However, one reason I went with the Revel m126be was that all the reviewers said that they were relatively easy loads to drive (sensitivity 86 but impedance only dips to 4.7 ohms) and that they were not finicky to place in a small room, such as the room I am putting them in. (I don't believe everything reviewers write, but I cannot see a reason to mislead a potential consumer about those two factors. As a matter of fact,.I have read reviewers write about certain speakers that they require judicious placement and that they are power hungry.)
When I read a few different reviews on the Revel 226 I saw that sensitivity was rated by Revel as 90; another reviewer, who must have done his or her own measurement, put them as 88. "Erin's Corner" said that the impedance dropped into the 3s and I got the impression that "Erin's Corner" was saying that they would actually need more power than the 126. One of the reviewers said that placement of the 226 can take some work to get them to really perform.
The Forte IV is slightly shorter than the 226 but wider and deeper and heavier. I did do some reading on several speakers, including the Forte iV, and at the time MD has a couple oif pair marked down to where I wanted to be, but what I read, and some of the responses to questions I asked here on A'gon, made me think that they might not work well in the small room I needed to put them in, and due to that small room, I went with the smaller Revels (the 126s) supplemented by my old subwoofer.