What is a good PC or laptop do you recommend to run Autocad or SketchUp for interior designers?

3rd Generation Core i7, with at least 4GB Ram & 2 GB Intel Graphic card

I recommend a Dell PC with:

OS: Windows 8 Pro, 64 bit 

16 GB Ram,

Processor intel i74700,

and a graphic card: GeForce GT 620 if u want a good quality of render. 

I recommend the PC because its normally faster, more stable.

been using a i5core Dell inspiron 4 years now, sketchup v-ray, 3D MAX , adobe photoshop and Auto CAD works quite good til now.

PC is more  comfortable , more stable

I would recommend any PC or laptop with Intel core i3 processor with 4 GB ram and NIVIDA Graphics Card

To work with AutoCAD latest versions and multimedia software, such as graphics design work my suggest is Dell Precision" SeriesGB, its a very powerful mobile work station. It can be upgrade till4TB storage HD display. And also recommend HP ZBook G3,GB, HP's most powerful mobile workstation currently using in professional companies. I have been using this both workstations.

1-   Dell Alienware M18x Gaming Notebook 

Intel® Core™ i7-2670QM Processor (6M Cache, 2.20 GHz) 16GB DDR3 RAM 1600MHz 1TB HDD 7200 rpm + 64GB SSD DVDRW DL drive 18.4" WideFHD LED Display 1920 x 1080 Dual 2GB GDDR5 AMD Radeon HD 6990M AMD CrossFireX

2-Dell Alienware M14x Gaming Notebook

ntel® Core™ i7-2670QM Processor (6M Cache, 2.20 GHz) 8GB DDR3 RAM 1333MHz 750GB HDD 7200 rpm DVDRW DL drive 14.0" High Def+ with WLED backlight Display (900p/1600x900) NVIDIA® GeForce® GT 555M GMA with 3GB DDR3 dedicated VRAM

Laptop or Pc is depend on office where you work. With laptop can work from any were any time.

I will suggest - Intel Core i5 or Core i7 processor (Basic Speed > 3.0 Ghz - if possible) - 8-16 Gb Ram - 2 Gb Ram (dedicated) graphic card

Several things decides whether to use a laptop or a pc for Autocad Or sketching both plays a good role in performing the task.

PC is cheaper than laptop and we can get larger screen to do our work properly but it is best for office work because it is not portable at the same time laptop is portable and we can carry it to anywhere,we can carry it to our seniors or other experts for evaluation just like we carry our notebook in our colleges for discussion.

Good PC to run AutoCAD can be any with good ram and processor, example

Dell Inspiron 153542

processor: Intel Core i5_4210U

RAM 4GB

Inbuilt HDD:!TB

OS:Windows 8.1