Ideas for a GURPS play by post? Insight needed!

[Raekai]

Copied from my post on /r/rpg here. There's a pretty good community there, but I knew that I also had to ask you guys!

Hello, all.

I have been running and playing games with the General Universal Role Playing System for a long time, and my GM has been playing for way longer than I have. After running a couple campaigns that died out fairly quickly, I think I am ready to take the reigns once again!

One of my biggest problems was availability. People were out of town, people had to work, people had projects to be doing. The worst times were when I had something planned out, but someone had to cancel last minute.

However, play by post seems to really cut those problems down. Yet, I've never done something like that before. I know that there are different IRCs and different forums and sites to use, but I have no idea of which one(s) might be best for me and my group. The group will be 4-7 people (I haven't approached them all, but I know that several will be willing to play), and, like I said, I'll be running the General Universal Role Playing System. This might sound crazy, but I would really like a site that is simple but robust.

I want to be able to log in and take up whatever names I need to as a GM. This is going to be very story like, so I want to be able to call myself GM when I'm acting as myself or Bob Thunderbutt if I'm role-playing that NPC. Players could also differentiate from being Sam My Friend or Sam the Warrior if need be. A dice roll mechanic would be great. However, I'm really looking for a way to somehow integrate actual dice rolling. Video feeds? I dunno. I thought I heard of a site that had Google Hangouts integration. We all use Google for stuff like that. I really trust my players to roll and tell the truth, and I've always found that virtual dice are really... Bleh. To each their own, of course! Furthermore, I'd like to be able to direct message players or have something appear as scrambled to other players if it's in a language that only a couple characters can understand. Of course, I'm not too worried about that. It seems like a weird feature that not a lot of places would have. Some kind of Excel integration would be nice. Or just charts... Floating charts? I dunno. I write up characters and monsters in Excel since it just seems to work well with the General Universal Role Playing System. Or something with a wiki! I could have sworn that there was a site like that... As a final note, if this play by post system could be accessed across devices, then that would be awesome too. Tablets seem to be the way that people are going these days! Oh ****. That made me sound old.

I don't know too much about this stuff, and that's why I'm coming to you guys. Most of the games that I have played, I have played them around a table. No game has ever been too concerned about a hex board or miniatures for knitty-gritty stuff. We're all creative people and we like to tell a balanced story with rules (hence why we actually use a game system and don't just free style). This time around, I just want it to be fun, and I want everything to work out well.

In advance, thank you all who are willing to help me.

TL;DR - I'm looking for a play by post medium preferably with some or many rich features (video, name change, dice rolling, wiki, whatever) but remains simple, and can also be used across devices.