I don't know how long ago you asked this question, but the 540EZ is VERY old. It's pretty much obsolete now. Go for the 430EX or the 580EX. They're a decent price, and work very well. If you want more power out of it, the 580EX Mk II is your best bet. ;)
Yes.
You mean 40D? Then definitely Canon 40D!
EF and EF-S lenses can be used on 400d. There is a lot of lenses out there.
Absolutely yes. Canon EOS 450D has the same mount as Canon EOS 400D, wich is EF and EF-S.
Yes, the Canon EOS 400D has both EF and EF-S lens mounts. Therefore, the TS-E 90mm WILL fit on the camera because it has an EF lens mount.
I personally, like nikon d60 more than 400d
In Europe they are also called the 400D. I don't Know about Australia, but there is a big difference in price. If memory serves me well the Firmware is different and of Course the Rebel Badge.
The Canon 400d is a Single-Lens Reflex digital camera, offering a resolution of up to 10.1 megapixels. It can also accommodate an add-on called a 400plus.
The Canon website is an excellent starting place to look for any Canon product. Websites such as ebay or amazon may also have used products available for purchase at a reduced cost.
The Canon EOS 400D Digital SLR camera comes equipped with a variety of features. The camera comes with autofocus, 10.1 megapixels, a 2.5 inch LCD screen, rechargeable battery, and integrated sensor cleaning system.
You can find the best prices for 400D Canon Cameras by using the price comparison feature on Let'sGoDigital's main website. Amazon and Walmart also offer competitive pricing.
There are many places where one can buy an EOS 400d online. One may purchase this camera from it's manufacturer "Canon" directly. One may also purchase these cameras online at eBay.
The Canon EOS 350D (Canon EOS Digital Rebel XT in North America and the Canon EOS Kiss Digital N in Japan) is an 8.0-megapixel entry-level digital single-lens reflex camera manufactured by Canon. The model was initially announced in February 2005. It uses Compact Flash storage and a Lithium ion battery. Part of the EOS, it is the successor to the EOS 300D and the predecessor to the EOS 400D (or Digital Rebel XTi), which was released in August 2006. Since early 2008, the 350D has been remaindered (production ceased in 2005).