From my experience, I have observed that people suddently decide to procure a product need for which they felt for long, suddently and visit a show room. In the show room they face the problem of choice between various models of a particular product and rival brands. For long , they remain undecided in the show room and in most of the cases return back by ptting off the date of procurement. This happens because, they did not have knowledge of existence of various models of the same product, and availibility of rival brands. This can be avoided and you may make a pefect purchase if you ;-
Decide as to the budget you have for the product.
Your necessitiy or the purpose you want to achieve with the product.
Choose the product and the company service centres of which are located near your town.
Compare with prices of various brands , their reputation .
If one decide the above in advance, surely he can make a perfect purchase best suited for his budget, his necessity.