What I want in a Twitter client

I've been using TweetDeck on my work PC, and Tweetie on my Mac, and I now know exactly what I want in a Twitter client. More-or-less in preference order, or at least numbered so we can refer to them...

1. MUST handle multiple accounts - I have my personal account, my personally identifying / work account, my online class account, and my bird's account. (Both Tweetdeck and Tweetie have this).


2. Tweeting: I want to be able to post the same tweet to multiple accounts without having to copy and paste (TweetDeck has this, Tweetie does not)


3. URL shortening (both TweetDeck and Tweetie have this)


4. Deleting: I want to be able to right-click or something and delete the tweet. (TweetDeck has this, I don't think Tweetie does)


5. Following: I want to see a single stream for tweets everyone that I follow in any of the four accounts, with a smaller copy of my own icon in the bottom info line indicating which of my four accounts is following that person (or which multiple accounts). In other words, I want the multiple following streams to be integrated into a single stream so that I don't see the same tweet from @Astro_Mike three times just because I'm following him with three accounts. (I have yet to see this in a Twitter client, and this is the one thing that'll make me switch Twitter clients at this point.)


6. OS: I want the same program to exist for both Mac and PC, and look identical for both. (Nope)


7. Multiple computers: I want appearance preferences stored on a server and loaded when I load the program, so that if I change something on one computer, it comes up on another one. (TweetDeck supposedly has tihs, but it's broken and hasn't ever worked for me.)


8. RT: I want when I RT for it to by default start with "RT @blah:" rather than ending with "(via @blah)", and I want to be able to edit when I RT. ("RT @blah:" is TweetDeck's appearance, "(via @blah)" is Tweetie's)


9. Pop-up notification: I want the ability to show the pop-up notification in various sizes, colors, and positions - corners do NOT work for me, I want right edge of the screen in the middle. (TweetDeck and Tweetie [via Growl] have limited choices here, but not enough.)

So, anyone know of a Twitter client that has all these, or want to write me one? *grin*