Our family of 3 is a laptop family. Dell for hubby's business, Dell XPS M1210 for me, and Dell Inspiron 640 for daughter.
We got the heavier duty model for daughter because we knew it would get some bumps along the way. We ordered hers with software that she would need which a lot of businesses use as well. She just uses what she needs. I am not sure how much extra is on the Vostro you speak about. Daughter LOVES her computer and uses it a lot. It has come in very handy with accessing sites for her research on school work, creating cards and art with Hallmark, homework, etc. We are glad we made the purchase for her.
For those of you who are wondering....YES I monitor her computer and I do NOT have spyware on it so I can snoop. We run an open book home around here!!
On all of our computers, we did get the extended great warranty. 1 key on hubby's keyboard went out and Dell sent a rep to our home the next day and it was replaced at no cost to us. The service is unbeatable. We have also used Best Buy when another older model Dell broke down and they did a great job.
Since we have purchased our computers, ALL through Dell, and over 1-2 yrs ago......Best Buy and some other stores now carry them. Maybe you could "test drive" the models you are looking at there?
Good luck with your decision!