hi we are keen to get the cannon EOS 550d with the 18-55m lens kit. Also keen to get a zoom lens but have no idea what to get. There is a twin package with the canon 55-250mm IS but not sure if this is actually any good. we have never used a dslr before so seek some advice on a zoom lens. want something easy to use, reasonable price. most of our shots will be of the kids (all under 5 at the moment), though we also travel a lot so scenery / monuments etc. any advice?? or dont we need a zoom at all?