Your wifi speed depends on your router also. The card and the router will negotiate the fastest common speed.
The numbers you see on wifi devices are huge lies. They do stuff like add transmit and receive speed and other deceptive stuff. It would be like calling gbit ethernet cable 2gbit but ethernet can actually send and receive 1gbit at the same time unlike wifi.
If you look at fairly average equipment on 2,4g you might get 100mbps most people get far less. On 5g you might get 300mbps. You can't add the 100 and the 300 though like the box does because a single device can not use both bands as the same time.
Now there is newer wifi 6 stuff but you likely would have to replace your router. That can get 600mbps for top end equipment.
The speed you actually get on wifi is impossible to predict. It depends way too much on how your house is built. You could have a single concrete wall between you and the router and you can get no signal at all.
In general most people have routers that support a number between 1200-1450 so you want to buy a similar card. These cards are fairly inexpensive. The best cards have antenna lead so you can extend the antenna to the top of the case. I think there are cards in your price range.
Avoid unknown brands they likely work but support is harder. TPlink, Asus,linksys, etc all make quality product.
Do not expect magic if you get 200-300 on the 5g band you are doing great. You will still get random lag spikes in online games because your neighbors signals will interfere.