Errr, 400D?
Nothing wrong with it if you're going to use it to shoot stills.
If you want to start doing video then 550D - 500D is a bit 'cut down' in comparison.
The lenses are the key, really, although it all depends what you want to do with the thing.
take it by the errrr ive got the name wrong 
or are you suggesting a 400d?
yeah the cameras mainly going to be used for shooting photoes of cars at shows, maybe some on the track and then general photography, video wise, ill proberbly use it but it doesent have to be anything speshal 99% of the time it will be for photoes. tbh it doesent even need a video function as ide be happy to use my phone
I think it's been assumed you've already got a 400D
In terms of "value" you're looking at Sony, canon, Nikon
the Sony alpha range offers good value DLRs that are great to get you started but have limitations in the lens and accessory range.
canon are because of the way canon and Nikon price their ranges.
canon and Nikon's camera sit between each other for example the mid range canon will be £600 the mid range Nikon will be £700 with the next canon being £800 and Nikon £900 and so on. This doesn't make Nikon over priced, it's because you're getting a better quality product which is reflected in the price.
Canon offer a wider range of bodies specifically consumer end and amateur.
Canon have been including video for longer so it's more mature in that respect.
Then you have Nikon, Nikon bodies are generally better built and have better low light and auto focus performance than the canon "counter parts" however they are more expensive.
I terms of where to start a better question is; I've got £400 what's the best camera I can get?
Let us know your budget and we'll go from there.
