I have been messing around with different settings in Sony Vegas 9.0 to get a good quality video.

I record footage from WoW and render it in Vegas.

I play the game at a resolution of 1400 x 1050 and obviously render it at 1400 x 1050 in Vegas. After I upload the video to youtube and wait for the quality to shine through, I don't think it turns out as it should do.

Here is a video for example - YouTube - HoofitWarcraft's Channel

If you noticed the parts where I had zoomed in to the chat box; you can read the text very clearly, but when i'm not using pan/crop you can barely make out any text in the video... so basically I think the video should be larger when viewing it. Yes the full-screen mode is an option but i've seen WoW videos the video would be about a quarter bigger than my own video's without the full-screen option.

I tried playing and rendering at a resolution of 1680 x 1050 (wide) but it didn't turn out how I hoped it would -

I can't try 1600 x 1200 because my monitor is too small.

tl;dr - I want to view my videos in a bigger scale on Youtube, by default with a resolution of 1400 x 1050.

Any help would be appreciated.