You can feel safe with Planet Micro. I've used them a lot and they only charge £4 delivery and I've always had any item next day although the £4 delivery does not promise this. I've bought several base units from them and also two (one for someone else) Maxtor external drives. Just had a look on their site and trouble at the moment is lack of stock it seems.
So anyway, for what this is worth, if you can wait a little while at this time -- Planet Micro is a sound outfit -- you can even contact them by phone if you like. I visited them once and they are a great bunch of customer-orientated very pleasant people.