Buying a domain and don't want to fuck up the SEO

Are you worried that the domain itself won't give any boost to your SEO efforts? Because I wouldn't really worry about that aspect of it - even bad domains rank fairly well these days. I think Google realized that aspect of the system (domain name-based SEO bonuses) was a bit too easy to game.

Instead focus on good link building. This works best for me these days, once the on-page factors are fairly well optimized.

buying a domain the reflects your idea/keywords is in most cases buying a random name.

A 301 and your task is done