-You can go with Celeron (cheaper) instead of Pentium.
-- I was thinking the Pentium so I could have the CPU doing some light burstcoin mining on the side and read the HDD's a little faster
-You don't have to go with expensive SSD, simply get any cheap regular hard drive.
-- I was thinking from a general power standpoint that SSD takes less... Does the power consumption really make this much of difference in respect to the HD used in a rig?
You will want a CPU with more horsepower if you want to mine BURST on it. I'd recomment a quad-core as a minimum, perhaps the bottom-end i3.
SSD is going to be a total waste, since you NEED a sizeable HD on the rig anyway to make it WORTH mining BURST on it.
I wouldn't bother trying to mine BURST on anything less than a 1TB unless I already HAVE the drive - and my recent rig builds have been going with 3TB drives (except for one that has a Seagate Archive 8TB).