Guys, please don't go off-topic or insult other people - absolutuely no need for the latter and the firrst is just spam as well.
Anyways...it's up to you - and different people will advise different things. I wouldn't worry too much about messing up the EV training though - certain berries can remove the EVs Pokmon have meaning if you make a mistake you can start over with no problems (as long as it's not level 100 =P). Of course, getting another one will help as you can go both ways. =P
Think I'll close this now then - half of this is off-topic and the TO already is planning to get another anyways (and has the means to do so I suppose?).