Brushless is very easy. You just need a decent 4 button charger that has AC/DC capability and will do 4- 6 cells. I have the Overlander and you just plug your battery and balance port in and select the program and away you go. You just need a Lipo safe sack to guard against fire.
I have the TT MT4 G3, which is a 1/8 truggy and have Turnigy and Zippy 4s batteries. A mah rating of 5000 or so gives a good run time (mine does 20-30 minutes per battery) depending how you run it. Hobbyking is good for cheap Lipos. The C rating gives more of a burst of power, the higher the C, the more punch the battery should have.
Top speeds should be comparable or even faster than nitros, but this depends on various other factors.
I know of loads of people who have had nitros and then they have broke down and been unable to fix them, and simply given up on the hobby frustrated.
Brushless are not bullet proof, ESCs and motors can go, and I am awaiting a new steering servo, but they are usually pretty reliable. Just plug in and do a few laps while the nitro owners are getting set up!