Really all I can say is that you seem to be going about this hunt in a very good manner. You don't know everything, but you certainly seem to know how to find out- so don't worry about that.
You cover a good spread from terrible to great in terms of quality, value, and longevity or "how long you will continue to like or love the bike."
The felt brougham is a great bike and I would actually suggest you test ride it, or test ride it again, if you're still considering other bikes.
The felt will be a much much better quality bike and you will love it for much longer than any of the cheaper fad fixies like the phat or phly or whatever, just because it is better quality and it's a name brand. not to mention, it holds higher resale value for longer.
The kilo WT or steamroller are even better because they're not as 'stylish' and instead they are simply great bikes. the kilo wt is a good value, too... perhaps the best of the bunch.
However, don't sell yourself short on the raleigh.
The Misceo, unless i'm mistaken, isn't offered as a singlespeed. It's also a totally different class of bike, and is going to offer a different fit, ride, and feel as any of the others.
to start, it's aluminum. that won't make it lighter with all the gears, suspension, brakes, mtb geometry and tubing... but it is a hybrid with large tires which will make it comfy despite the aluminum's tendancy to 'buzz' and ride harsher. the gears and flatbar indexed shifting will make it faster in more adverse conditions and sustaining lots of stopping and starting getting up to high speeds, as for city commuting, or it will make you less stressed as your muscles(motor) adjust to the new activity and optimising your performance.
That, and the mechanical disc brakes aren't hydro stopping monsters, but they WILL stop you much faster and better especially in rain or puddles or snow or dirt than any of the other bikes.
and it does all of this at a lower price point. that's why bike companies sell more hybrid commuters like the raleigh than singlespeeds for freaks and geeks like yours truly... it's just in general a more capable and more utilitarian bike that they can mass produce and price at a great value.
also check out the furley... raleigh's cross disc offering that gives you steel and singlespeed. honestly the only thing i'd consider out of this thread aside from the raleighs would be the Kilo WT.
The cheaper brightly colored fixie fad brands are not going to give you the quality or value of the higher priced offerings from the likes of felt and raleigh.
and this is totally not about the brands, because i haven't owned a felt nor a raleigh in my life... i just have ridden then and inspected their quality from my friends who swear by them.
and if you want a bike that's going to kick ass and outlive any of the other bikes because of the features and capabilities it offers, this may be the best value in the long term:
http://www.raleighusa.com/bikes/steel-road/furley-12/