Here's my "short" answer, followed by rambling...If you have any desktop applications you can't live without, go for the Acer or other x86 tablet. If videos are your highest priority and you don't want to wait for Surface to come out with great video software, go for Android. If browsing, blogging, file explorer and design are your highest priorities, go for the Surface.
Now the rambling...The Surface RT browser does not seem to get much hype, but let me rave about it for a moment - IT'S A REAL FREAKIN' WEB BROWSER - not a mobile phone browser or a tablet browser ... I live in my browser when I'm not at work and It sounds like you spend a good amount of time online also so I would definitely put this into your mix for consideration.
I have an iPad an a 7" Android tablet - the web experience is not at all the same. I've tried Safari and Chrome and Opera and Dolphin and ... Many others ... All fine for quick searches but I wouldn't want any of them as my only browser option. Let me also say don't try blogging on a mobile browser ... I've got 2 blogs and it's nothing but frustration ... but blogging is brilliant and easy on the RT (I use blogger, though)!
I'd guess Android probably does better at Videos, but Surface is already getting some good third party software and I can't imagine it will be too much longer before there are solid and robust offerings. I haven't actually tried to play a video that didn't work, but I know there are numerous formats out there and so I would assume the newest platform (Windows RT) may not play them all yet.
I had the Ativ 500T (Windows x86) because I thought I could not live without legacy software but replaced it with the Surface (which I prefer). The design and quality are unsurpassed, and I found I really didn't need to run desktop applications for 99.9% of what I do. This may sound strange, but the Surface is actually way faster because there isn't a whole bunch of unneeded crap always running in the background.
Very helpful reply. I'm not even in any doubts anymore, it'll either be a Surface RT or a Surface Pro. A Surface Pro might be possible, cause someone on a Ebay/marketplace-like site is selling a 128GB for 650 euros, no keyboard included but holy crap, if that deal is going to happen, that's crazy good. If not, i'll go for the RT. I'm on the fence about whether to go for touch or type cover though. I thought touch would be horrible, but at the store just now it really wasn't too bad at all. But i don't know about the material, it feels kinda like fabric and what if it gets dirty or some ugly spots...can they easily be removed/cleaned?