You guys were great, really narrowed down alot of the decisions, I got some explainations of things I didn't understand (gave out some rep for that) And while I wasnt expecting two completely diffrent options to come down to the same price I was quite glad, what I really didn't expect was for two completely diffrent options at the same price point to not have a clear winner!
While the room isnt silent like a studio because of the PC in the background I don't think its very noisy either the PC is only about 1 meter away and at the same height as the microphone without any physical object between them. But it is directly behind the mic, which I would hope with a Cardoid pickup would mean that it wasn't a issue at all.
Edit: the little heatset mic i'm using has all these little holes on the opposite side of the bit you talk into, And I was told that it 'listens' to the background noise with these and then pre-filters that unwanted sound that isnt coming from the person speaking to give a nice almost 0 background noise recording, none of the other heatset mics i've ever owned has had these extra mic holes and none of them like I mentioned before ever gave me a good recording without background rubbish in recording software that takes directly from your mic without filtering, programs such as FRAPS, Adobe Audition and Audacity
Almost all of the same headsets sounded alright with programs that have software background sound removal such as Skype, TeamSpeak,Ventrillo and built in-game VOIP. So I suppose as gaming headsets are designed to be used with the Latter rather than the Former thats why you don't see any High Quality Mics with things like the holes on the mic.
Edit2: it occurs to me one I do decide on a Mic that means i'm free to actually get a completely diffrent pair of headphones without a mic on them, On the Yeti I remember that you can monitor by plugging a headset into them, but I can't remember if you can also use it as a regular output device to listen to everything on the PC as well. The reason i'm wondering is if it works as a full output for all PC sounds aswell I might be better plugging everything into that rather than the onboard soundcard, same question about the Lexicon Alpha too.
I could really get a very nice pair of Sennheiser earphones somewhere down the line, i've always wanted something like that
Edit3: Woah thats a big price disparity between the cheapest and most expensive Sennheiser, I really hope there are a few gems somewhere amongst the cheaper ones and that it isnt a straight parallel line of price to quality. HD 518 seems like a good choice after I do a little saving up