Been thinking about what's a good stock to buy now with some spare cash? The market's been on a pretty solid run for a few years, and honestly there's some interesting opportunities if you know where to look.

So here's the thing - the S&P 500 has crushed it since late 2022, up nearly 95%. Banks like Deutsche are calling for 8,000 by year-end (another 15% from here), and Goldman's betting on a 12% rally this year. If that plays out, you'd be kicking yourself for sitting on the sidelines.

I've been looking at three sectors that seem primed for real growth. First up is quantum computing. Yeah, I know it sounds futuristic and all, but McKinsey's projecting the market explodes from $4 billion now to $72 billion by 2035. That's the kind of growth story that can make early bets pay off massively.

IonQ is basically the play here if you want exposure to quantum. They're designing and building quantum computers, plus offering services through major cloud providers. Revenue in the first nine months of 2025 more than doubled, with Q3 jumping 222% year-over-year. They hit a world record 99.99% accuracy on their quantum systems too, which is a big deal for moving this tech mainstream. Their systems cost 30x less than competitors. Sure, the stock's pricey right now and volatile as hell, but if you're looking for what's a good stock to buy now if you believe in long-term disruption, this could be it.

Then there's the AI infrastructure angle. Gartner's forecasting AI spending jumps 41% in 2026 to hit $1.4 trillion. That's insane. Celestica's benefiting big from this - they're designing and manufacturing networking components for AI accelerator chips from the heavy hitters like Broadcom and AMD. They also build rack-scale solutions for hyperscalers. Revenue jumped 27% in 2025 to $12.2 billion and it's expected to accelerate. Trading at just 3.2 times sales, it's honestly a no-brainer if you're asking what stocks to buy right now in this space.

Micron's the other AI play worth considering. Memory chip shortage is real - demand keeps crushing supply for chips used in AI data centers and everything else. Micron's growing like crazy with sales potentially up 100% this year, and earnings could quadruple. They're trading under 10 times sales with a forward multiple of just 11. The shortage should keep pushing memory prices higher through at least 2028 since adding new capacity takes time. This stock's already up 243% over the past year, but there's still room to run given the supply dynamics.

So if you've got $1,000 sitting around after handling your expenses and debt, these three sectors - quantum, AI chips, memory - are where I'd be looking. Depends on your risk tolerance, but any of these could be good stocks to buy now given where we are in the market cycle.