if you are not gonna string more than that, then I would buy either a good crank (ex.Tyger) or if you really wanna go for an electronic the pro´s pro.
the crank will last allmost forever if you choose a brand you can get spare parts for, i got a Tyger and if something breaks I just go to transocean and get it right away, big advantage!!
the Babolat I used to work on in a shop once broke and we have to ship it to france, it was sooooo expensive something like 10000 kr.. thats why my advice is...if you really want an electronic then go for something cheap like pro´s pro, you get your 2 years guaranti and if it breaks after that period then buy a new! but seriously I would buy a crank.
you can buy a good one at transocean for around 6000 kr (Tyger), but I heard good things about the pro´s pro cranks too, I just dont know if its as easy to get spare parts to as the Tyger is..