Agree with the above - also - get several opinions. Ask people with various types. I've had a HP and couple others, using one my brother made from spare parts now. It's really in the software you put into it. Recommend at least a 17" monitor so you can see a whole page of text.
Development is at a "plateau" at the moment, my brother says. So take your time. Look at several. Check sales. Don't be afraid to bargain (can you throw in turbotax?).
I heartily endorse an ergonomic keyboard if you do a lot of typing. Takes a little getting used to but it's a lot more comfortable. Elaine. It's only about $20.
Oh yes. Think about printer when you buy the computer. Check the cost of the ink before you buy it. It's significant.