Welcome!...A buggy on 4s li-po is v/fast,...on 5s they are stupid fast. Nen motors are the best motors avail. because they are so efficient, smooth and durable. They are also the most expensive...quality comes w/a price. I have a 1512 1.5yF in my mbx-5 and it is perfect. If they are too expensive, look at the Medusa 60 series motors.
As far as esc goes, the MMM is the smoothest out there. It looks like they have worked out the bugs w/the controller and besides, their customer service is v/good.
As far as li-po goes...Poly Quest and Thunder Power have Enerland cell, which many consider to be the best...but, v/expensive. Zippy Li-po are also used here by many w/good results.
Hope this helps!
1. MBX-6 T8 1900KV, RX8 ON 4S
2. MBX-5T 1520, MMM ON 5S
3. MBX-5 ONROAD CONVERSION 1515, MMM ON 5S
4. MRX-3 ON ROAD CONVERSION 1512, MMM ON 6S
5. TEN T 2650 T8, MMP ON 3S