I bet he's been mentioned a million times, but Lukaku from Anderlecht is a beast up front. 7 weak foot, and 190 cm and 16 years in the beginning of the game!
Highly recommended.
Have to agree with you on that one, especially after the recent update 72 overall rating at 16!!
I tend to go for the unlocked players on free transfers at the begining until my team builds up some rep and cash.
Dentinho is a great forward, quick and a good dribbler his finishing is a bit suspect at first but once thats developed he's great.
Neymar is also another striker almost exactly the same as Dentinho but starts off 3 years younger at 17.
Boateng CB, is another great free transfer 70 overall rating if you can get him a bit of pace, strong and a good header of the ball, decent tackler and after a few years he becomes great.
Ozil a great AMF or SMF 77 overall, sweet left foot great dribbler and passer.
There are some good players that I haven't tried yet that might be worth giving a go like but be warned some could be expensive!
Alan Kardec (CF), Welliton(CF), Wellington(CF), Alex Texiera(SS), Diogo (SS), Sandro (DMF), Cristiano (GK), Louis-Hamilton (GK), Fiorello (GK), Osvaldo (CF), M.Sakho (CB), M.Sissoko (CM), Douglas Costa (AMF), Ninis (AMF). There's loads more that I can't quite think of at the moment that are great on FM/CM that all turn out to be immense, so they must be pretty decent on PES........ But I could be wrong.
For those having problems signing players you really need to have a look in the Other/free agent section where you can find some good young players or some classic players if like signing those players, personally I don't, but hey that's me. Otherwise you have to keep an eye on the transfer list players coz you might find some gems in there and after the January window keep an I on any player that has put their contract on hold because you can get them to sign a pre-contract to join you for free in the summer.