[MetalMan]

Okay, parallel (p) vs. series (s):

Standard NiMh cells that are used are put in series. This is where the positive of one cell is put to the negative of another cell. Series is just taking the + from one cell (or pack) and putting it to the - of another cell/pack, and using the remaining + and - leads to get the voltage of both cells/packs added together:
IE, a 4 cell pack (4.8v) put in series with a 6 cell pack (7.2v) is 10 cells (12v). This works EXACTLY the same with Lipos (5s=18.5v, 6s=22.2v). The "s" stands for series, so 3s means 3 cells in series. In the case of Lipo, 3cells = 3 x 3.7v=11.1v. Just think of series (s) as adding up voltage.

Parallel is pretty much the opposite the opposite of series. It is taking the positive of one pack and joining it with the positive of another. The same thing is done with the negatives. What this does is it adds up capacity. BUT, the voltage of 2 cells/packs put in parallel MUST be very close to exact (with Lipos). For example, putting 2 3s (11.1v) 3000mah packs in parallel will give 6000mah. To give a description of this "new" pack, you would say it is 3s2p. If this still doesn't make sense, I can try some more.

As for a recommendation, which vehicle and motor do you want to ue/are using?