A Router is a must! Its used to match sides exactly (flush trim bit), cut slots for t-molding, making holes in you CP acrylic, flush trimming laminate (although I used an angle grinder at first

)
For the price its worth getting a circular saw aswell! To keep all the pieces lining up perfect, otherwise you'll spend hours messing with rasps and sanding. Try to get one with a laser site. Very helpful and only a fraction extra.
Don't worry, this hobby is a drug so you will definitely get more use out of them! You could easily get both for 50 quid and they'd last you for years!