To get to the new airport you've basically got three options: 1) Taxi 350B, 2) Airport Bus 150B, 3) Khao San Road minibuses 120B.
Now if there are two of you the choice would seem to be a simple one - take the taxi! No need to read on!
If you're alone I'd also recommend the taxi but if you are really saving the baht you've got:
1) The Airport Bus - It's comfortable, spacious and relatively hassle-free. Disadvantages are that it doesn't run to a schedule - you've got to stand there and wait, and wait. This does have one advantage however: You might meet other travellers while waiting and get to share a taxi! One other disadvantage of the Airport Bus is that they seem to take the absolute longest, most traffic-jam prone route. You're at serious risk of missing your flight if you take one of these in the day time.
2) The Khao San minibus - Cheaper than the above, they run to a schedule and they'll come to your guesthouse. Great isn't it? Well you're squeezed in like sardines and some of those vehicles look like they're about to break down. You also have to book in advance, reducing your flexibility. One advantage is that they're in tune with the road conditions so they'll avoid the worst of the traffic jams.
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