You want a setup that feels good to type on for hours and lasts through years of heavy daily use. Spending a bit more now means you buy once instead of replacing a cheap board in six months.
Timing matters in this hobby since group buys take months to ship and back-to-school sales drop prices on retail boards. Watch for clearance events on last year's models to get the exact same build quality for less cash.
Just remember that 0% intro APR for 15 months on purchases and balance transfers is a hard deadline, not free money. If you still have a balance left when those 15 months end, deferred interest kicks in on the whole original amount.