I have a site that I've spent a shit load of time and money building links to (it has about 30k backlinks right now). However I'm thinking of buying a new domain name which is more related to my niche and contains my target keyword. Will there be any disadvantage whatsoever if I 301 redirect my old domain to this new one? And also, what happens with regards to deeplinks? Will old-domain.com/forum pass all link juice to new-domain.com/forum? Thanks.