Well, just playing 2011 titles if you're reasonable about the graphics settingsAsus A53
- this is a decent entry level gaming spec. i5 is a great CPU and 540 has proven itself to be a solid GPULenovo
this has got i7 quad core CPU, which is among the best CPUs to date. GT555 is slightly better than 540. See if you like the design, cause I know many people find Lenovo ugly looking.HP Pavillion
this one if you want to go AMD route, has got the latest released llano APU and an entry level gaming GPU. This should give you great battery life if you run in on integrated GPU.
if you decide to get a laptop for CAD work rather than gaming, I'd suggest looking for a laptop with better CPU like that Lenovo (i7 CPU) and good amount of ram (at least 8Gb). Alternatively, an llano machine with no dedicated should perform really well in CAD