Its a beast to move... some person from another forum I know has one and there are better 20" options... its graphics are underpowered and Acer has horrific support (he actually got it after like a few months as a replacement for his broken laptop)
Check out
www.xoticpc.com
www.powernotebooks.com
Both have great reseller ratings (look them up on the site they have links from themselves too) and they sell notebooks that are also sold by companies like HP and Dell but have great service because they are small companies (Basically companies like Compal Quanta and Clevo Make laptops for companies and they sell those same laptops unmarked (ODM) to the small sellers
They have some great laptops... Also keep in mind when you use a laptop it will be at half the distance as your screen I was a nerd and calculated it out once and its seems like a 50% larger screen from half arms length/lap to full arms length (so 17=23/24 and a 20=30" but 30" screens have much higher resolutions so it might look bad)
The acer is rather expensive over 2kUSD if not 2.5k USD if memory serves me right
You can get a very fast notebook for that
I would go with a 17" maybe with a 7950gtx check out sager models on xoticpc for notebooks with that card... I wouldn't go 20" because you can get a higher resolution with a 17" pc
Or if you want to get direct x 10 get a compal ifl90 with the 8600gt because that is what dell is putting in their 17 inch "entertainment" non xps laptop
Another option is the coming up Asus C90 which if you have the skill to install components yourself and put heatsinks on you buy the chassis with graphics, dvd drive, screen, motherboard, etc.
You then put in a desktop processor and all of the other components and as new cards come out for the mxm slot it has you can replace its graphics card it is highly upgradeable and will last you a good long time
C™ technologies2, the Aspire 9800 takes you way beyond the notebook norm! 
