Dear,
I have a 150 mbps link attached to a Cisco 1921 router and I want to replace the router with a routerboard. What equipment would you recommend for this routing task and taking into consideration upgrade of up to 300mbps?
I think that you can buy mikrotik CCR1009-7G-1C-1S. he has redudant power supply
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https://mikrotik.com/product/RB750Gr3 if at home
or
https://mikrotik.com/product/rb1100ahx4 if you have the budget or business use.. 
CCR mentioned by nemanja82 is also good, but a little more expensive.
Yes it’s little more expensive, but it is a very powerfull device. Offcourse it’s depending on budget.
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Don’t worry about price when the poster has not mentioned it… even the CCR1009 costs only about 1/5 of the original price of the Cisco 1921 he is replacing, even though it is much more powerful.
So his price/performance ratio will improve a lot.
The ethernet test results in mikrotik product description are for all ports or just one port?
All ports, traffic flowing one way only. At the bottom of the charts You can see the RFC used (RFC2544).