Yeah, been tempted by the 1.4 too, its a cheap way of getting more reach - but you do lose some quality.. might be worth it though. Ill probably have a go with one some time, a local shop where I got my 70-200 has them in stock.
The kit lens is ok, Serious. Its 18-55 mm F3.5 to 5.6. It can be a bit dark, if anything and it is not quite as good as the L glass - it just lacks that extra sharpness.
The two lenses together mean your fairly covered from very wide, to reasonably zoomed in.
The 300+ / 400mm lenses are horrific, money wise
cant afford it, let alone justify it no matter how much I want to zoom in that bit more!