New domains or Sub domains ?

Hi

I want to set up a few online stores sell products related to my main sites, however I have a concern.

I could bolt the stores onto my current domains, but I worry that this could dilute my main content in the eyes of the search engines. i.e. I have an accommodation site about 100 properties on it so far, about 600 pages of content. If I add a book store, about 5000 pages of content would that negativly effect the strength of my site in the serps for its primary purpose?

If yes to the above, would sub domains be the way forward, to try and keep the identity or, should i start new domains?

Your opinion would be appreciated

Jamie

new domains....

__________________
Rob - SEO Specialist
Owner & Founder of Webforumz.com

I am currently unavailable for private work

Thank you Rob......

I hope to be signing up again shortly to your highly esteamed Search Engine Optimisation Advice

Jamie

I also run all my site from the same provider off the same server - is this a ad Idea??

I hear things about c class, IP etc

You opinions please

Jamie