If we are talking investment merit, Spain in my view has a veery long way to go before sustainable capital appreciation gets underway- there is simply too muc housing stock remaining in bank' repossession portfolios- even when they're giving it away with 110% finance, they cant move it, so not interesting for capital appreciation investment.
In Portugal the problem is less pronounced, so you wouldneed to compare relative valuations vs other markets, on a property per property basis.
In terms of life style merits, neither compare in terms of quality with the Eastern Mediterranean. And of course Portugal is an Atlantic coast, which means the weather is less favourable and winds stronger etc,.
Greece is definitely not too soon to look at- already Greee is benefitting from Russian, Turkish and the usual US and European demand- but if either of the latter surges, there is going to be an upward tick in prices. Most fo the discounting finally began to occur in the last year or so, but hasnt been ongoing for very long, and it perhaps may not- Greece is relatively expensive, no doubt- but with good reason- it offers one key facet of investment merit essential to every really good porerty investment- and that is the ability to source truly unique properties- for a variety of reasons, not least being that for the most part, most of the islads are distimctly different in many differnt respeccts- peoples, cultures, foods, economies- it's almost as if they are each separate little countires- ok they are not as different as the different countries in Europe are to one another, but they are certainly more different than each of the states in the US are to one another. And many of the mindsets on these islands are first as independent islanders, and second as Greeks. Many of the islanders have tbeen to Piraeus/athens, but most have never been to ANY neighboring islands. History played a role- for example many of the Dodecanese spend long periods as domains of Genoese, Veneitioans, chevaulier orders, etc. You have to know the islands and Greece well to appreciate this, but once you do, there isnt much question,
Add to this the limitations on new supply coming onto the market whcih can depress capital appreciation potential- in Greece it is difficult to get new supply onto the market- not just because of present economic austerity, but becaue of the maddening hold-over of un-modernised bureacracy from ottoman times, and the high costs of building materials, their transportation etc. as a friend who has sailed th islands for decades remarked to me- 'it's amzing, nothing has changed her for the last 30 years...it's still the same...'
Finally the geographical attributes of the Islands are both uniqus and exquisite, as is the historical dimensions of the cultural antiquity evident everywhere...Yes Greee is relatively and comparatively expensive, but justifiably so, which is especially important for tope end purchases, because its the unique differentiation of property that commands the pricing premium at the tope end of the proeprty market.
Yes Greece is definitely worth putting on your radar screen and following, because it will take time to find wehat you want and transact the business, so begin now...