EB, nothing wrong with Highland beach, not my choice but thats just a personal thing!
Its in a good location and rooms are apparently larger than usual .
As far as prices go, just keep reading the posts for the next few weeks and you will get up to date info, last year I was getting around 80rps to the pound and a beer was round 65 rps.
Food can be any price you want but even the expensive places are cheap in comparison to UK and most euro countries.
Clothing needs to be light and airy, high heels for ladies are not such a good idea nor are lots of lovely white expensive clothes.
Don't be put off by the airport and the first 2 hours of your holiday, ignore the dirt and etc you see on the way to the hotel and keep an open mind.
If the beaches at candolim are too busy for you , get a taxi to take you to Morjim/Ashwem beaches, around £10/12 for taking waiting and return. Lovely and quiet.
One tip I have never seen on here is to take one of those fold away ladies fans (like you see in old films set in Spain) these can be really useful on hot evenings.
Loads more tips if you look around the site, especially from those who are going early in the season.
Don't forget your visa!!