You may get better options in the same range. Flux neo would cost about 16k. Infinity alpha 650c are for around 13k and are more neutral sounding than MTX. there are even better options if you can raise taht budget to 20k with the JBL gto's, infinity reference etc. Never been a fan of any chinese amp like Rockmars etc. But since this is a begginer setup, you may opt for it to power your comps. However, to really setup a good sound stage, I'd suggest you also invest in a subwoofer in a sealed enclousure. So even if you can't get that now, I'd suggest you plan ahead and opt for a 4 channel amp so you may have 2 free channels to power up the sub.
I'd suggest you opt for atleast some good quality ofc 8 gauge power/gnd wire and RCA cables. There are great stores to buy authentic items from so always mention which city you are from and members can help you out 