Might be a bit early for a spring fruit beer, but it would give you plenty of time to get the taste you're looking for just right. Personally I like just a nuance of fruit in my fruit beers, but I make plenty of fruit beers for friends who really enjoy a heavy fruit presence. No right or wrong, just different strokes. Blueberries work great, as do Raspberries, Olalaberries, Strawberries, and just about any other berry or fruit (within certain constraints.)
We usually use a simple 50/50 Belgian Wit recipe, light on hops, and add the fruit after fermentation is complete, usually around 5-9 days. As many people have pointed out, add slowly and taste as you go. You can always add more fruit, impossible to take it away. Go easy on extracts, unless you like that kind of thing, and use as much real fruit as you can. Keep it simple and fun and you will have a great fruit beer in time for spring...