Get a site in same niche or start fresh?

Hi, I'm going to start a new project and found a 4 year old site containing my main keyword in in domain, it's pr2, with 600 visits per month, +100 backlinks (some a few years old), checked backlinksalert and is clean, only ranked in page 15 but they haven't done any SEO, includes a well designed site with premium wordpress theme and 20 pages of quality original articles directly focused to my niche, all for 1 k

Should I get the site or start with a new domain I registered 2 months ago which also contains my main keyword? I could build the site for about 200, spend 100 in articles and 700 in a good few months on a SEO package... Would you recomend spending the money in the site or building it

Are you sure the website is clean? Have you checked if there was any sudden drop in traffic? You can do this via SEMRush. If there was sudden drop in traffic, the site was most probably hit by an update, and it would be a waste of time and money if the site has been hit before.

The site is clean

Can anybody give me some advice? the time to buy is running out