Surfing Waves

Hi Guys,
I'm new to the forum and to surfing and am in desperate need of advice. I have only surfed a few times and managed to hit my center fin and break it off. The locks on the board are fine and I haven't noticed any other damage. I was just wondering what fins I should get and whether I should just replace the center fin. I am between 12.5-13 stone, about 5'10" - 6'. My board is a standard 7'6" Hawaiin Soul. I have been told I have the FCS G5 fins. These are quite pricey though, considering I only need a center fin I was hoping to save some money, I just need a fin thats great for learning, I was hoping to spend tops of £20 really. I'm a student and have no money for the whole summer

Thanks Guys and Gals,
Matt

I think they do G5 replicas on eBay that are a fraction of the price. I've been surfing a couple years now and changed to them when I snapped one of mine and I really couldn't tell the difference.