Time To Change My Computer

The desktop computer that I am currently using is over 3 years old. This computer has been giving me problems every now and then. Just yesterday, the keyboard acted up and I could not use the delete and backspace button. At times, my computer would just hang up on me. My hubs has been advising me to consider replacing it with a new one with better memory space. If I should replace it, I am not sure if I should get a laptop, an Acer Aspire netbook or another desk top. I am very, very tempted to get a netbook!