Since you’re not building up just for AE, I would stick with your second option. If you’re going to use AE with multiprocessing, AE uses for each thread (in this case 3) at least 0.5GB. So, the more RAM the better. Also, there’s nothing worse and more annoying than having your hard drive trying to do the job that you’re RAM is supposed to. IMO. Hope this helps. Good luck.
Best regards.
Nelson.