Next, we'll talk about the usage frequency. You can always make time and bring the cam out more often to justify the purchase. There are always outings you can join and it's always good to bring the cam along for family outings or gatherings with friends. You don't have to bring extensive setup, just a body with a walkabout or even a kit lens will suffice. If you really cannot afford the time to go for outings and do not want to splurge on a DSLR, then perhaps you may want to consider getting a prosumer (bridge) cam. There are a lot of 2nd hand ones with very good price available too.
Just my 2 cents worth.
Minolta. Konica Minolta. Sony
If you put it in "hibernation"; you have to store it properly. 40-50 % humidity, remove battery, remove lens etc.
As for the product working when you turn it on; I doubt you should worry much, my Canon's and Nikon's always turn on after prolonged non-use.
A simple way of looking at things; D90/450D has been out for like few to several months respectively. The cameras are in inventories and stock for some time but it still powers up the moment you open that box and put in a charged battery. When you buy a camera, it was not made the day before; as such this issue should be the least of your worries.
If it doesn't, at the very least both these brands provide 15 months warranty.
To the Thread-starter: Nikon D90 has several advantages over the 450D, but bear in mind if you continue to dabble in photography, your one-off purchase needs more consideration because there are lenses, accessories, external flash etc to consider. My personal opinion; if it is just a one off purchase; go for the D90. D90 body: $1370 450D body: $967. The $400 difference is to a large extent in my opinion justified.
One advantage of the 450D over D90, is that it have both contrast & phrase AF in Live View mode.... If Live View is important to you, than a 450D is a cheaper & better choice.
during all these years, i used a nikon cool pix and now a canon powershot...
i actually came back from a holiday and found tat money was not well spent... so decided to get a camera to compensate instead... lol...
i really like to own a D90 before CNY... shall monitor the price closely, i prefer to get from harvey norman as i really love their 5yrs warranty... got most of my stuff from them since i got to knw their 5 years warranty...
So why bother waiting, if this 'waiting time' can be used to capture shots that might make you happy?
Like that you might as well wait for the successor to the D90 to come out, then D90 price will DEFINITELY drop. You wanna wait till then?