All DAWs come with built in plugins, so Reason is not unique in this. Reason has limitations because it does not run VSTs, and that is a big downside imo. There's lots of free plugins that will get the job done, it's what you do withthem that counts.
Something like a Novation LaunchKey 49 controller keyboard would be a good entry level keyboard. The Rokit speakers are good for entry level, certainly in your price point. Just take note that the samller Rokit's do not go down that low in the bass department, so some headphones like Beyer Dynamic DT 990 Pro might be a good to have as well if you're going for small Rokit's.
That is all the hardware you need to get going aside a computer, and a dedicated soundcard. You can use the output from your computer for the time being if you cannot afford to get everything at once.
There are some ok entry level soundcards between £100 & £150, Presonus do a decent cheap one.
What spec is your Dell Laptop? You can get a decent i7 Lenovo with a high benchmark for just under £600, alternatively you can build an i7 desktop for about £400 - £500.