I planted 50 Red Latham raspberries in 1972. By 1974 i was selling the excess berries by the pound. The plants lasted for about 10 years and then slowly decreased and died because of nematodes. About 15 years ago i was given a strain of "everbearing" red raspberries (unknown cultivar) that have produced a nice early and late crop ever since, with no nematode problems as yet. Neither of these cultivars have bad thorns like blackberries but instead have little tiny thorns that are not injurious at all. See
http://www.umext.maine.edu/onlinepubs/htmpubs/2066.htm for good info on raspberries. If I were you I would try to acquire 20 or so plants and plant them in a row about 3 feet apart, fertilize and step back. Give them several years to begin production. Take care to control spider mites and raspberry fruit worms.
Regarding blueberries, I have planted several different varietes of them so that all do not ripen at the same time. I currently have about nine plants of four different cultivars that keep us in blueberries for a month or so each summer.
Important note: you MUST protect the plants (both raspberries and blueberries) from birds when they ripen or you will not get many berries for yourself. I use Toron bird netting and it must go all the way to the ground or the birds will get under the net.
