You can usually find an overseas Strat, and a fairly decent amplifier, packaged together for a couple hundred dollars.
Also, I like the Yamaha Pacifica as a solid beginner electric for a very nice price.
A solid-body Gretsch or any kind of an Ibanez isn't worth much, in my opinion. Hollow-bodied Gretschs are awesome, naturally, but you're not going to gain anything quality-wise from fixing up an old solid body.I completely agree with Eddeche and OWK: get thy son a MexiTele. Five years ago I was looking for a cheap electirc solution after ditching my Gibson ES-335, my US-built Fender Strat, and my Rickenbacker Lennon model (the black and white teardrop one), and I came across a MexiTele that truth be told, blew away every single guitar I've ever owned except the US-built Strat. I cannot say enough good things about this axe: phenomenally distinct sound, an action as smooth as buttah, durable as all-hell, looks great, and cost me less than 3 bills.
Let him play the Gretsch when he is older and will not break/lose it.
the Fender Stratocaster is a good guitar for everything from country to jazz to metal to rock and roll. Although if he is into metal or really heavy rock, sooner or later he is going to want to rock out on your Gretsch!
good luck!