When many startups are looking for domain names they are always looking for something on a budget but many make a mistake when buying a domain.
Example if your a global company you should really be looking at securing the .com and if your a company in the UK you should be securing a co.uk the issue these days is there is a large selection on other extensions and new GTLDS but these just do not work and this will make your brand look silly and will confuse your customers/clients.
My advise is to secure the correct domain and do it now rather than later just like with property prices the price is always rising same as domains a quality premium domain will always fetch a high price.
If you need any advise with domains i can offer assistance this is not a free service please contact for details.