What's your budget? What type of music do you listen to? What are your room dimensions etc...? Cables are the last thing to think about spending money on. They make a difference for sure, but for entry level you are better off spending your money on components that will make a real difference.
You will get answers for what to get. Most just post what we own or want to own. There are many products for a reason, but you have to match your system as sometimes the 'best' isn't the best with your speakers or amp etc...
Some will tell you that the pre amp or amp won't make as big a difference as speakers, but they do. They all make a huge difference. You have a nice start with your speakers, but they need some power and they need to have bass that can be controlled. As great at those speakers are, they are also very revealing so if you don't match the right amp or integrated amp, then you may not be happy for the long term.
You can look for used gear of course, however I always have newbies use a good dealer so that you can have some good advice and have someone to help you learn and grow. Also, being new, it's nice to have components that feel new and have warrantees on them. That's just my humble opinion. I'm sure plenty here will disagree.