the right router

 Hello Marel,
I would be very grateful if you could help me.
I have signed a contract with my internet provider for 200 mbps. However, at the moment my speed is no more than 30-50. 
When I signed the contract, nobody explained to me that in order to receive such high-speed net : 1: my laptop wireless card should be able to receive it. 2: my router should be able to spread signal with such speed. 
Ok, it appeared that my laptop can receive to up tp 100 mpbs internet. I can live with that, cause I cant change it.
But I could get a better router. Right now I am using TP-Link TL-Wr740N 150mbps. Which is why my net is so slow. 
Can you please advise me what would be the best specs for a router in my case. I would really appreciate if you could tell me what kind of standard I should be looking for, Ghz, Mbps. 
I just want to mention that I work from home with my husband and we use sometimes four computers at the same time. 
 
Thank you very much !