if you are starting from scratch again then definitely go for brushless and lipo.
brushless motors need no skimmin, new brushes etc. They just go on and on. They also have longer runtimes.
The speedpassion GT2 is an excellent speedo, one of the best around and certainly the best value by far with its programmer. Their new v3 motors are also the nuts. Which motor you get depends on your club. If it is indoor it may have a motor limit of say 10.5 as the lowest.
Most regular racers outdoors will run either a 5.5 or 6.5 in their 4wd cars.
And the Cat SX is awesome! You certainly won;t go wrong with one. Everyone has their own opinions about which car is best. Main thing is go down the club and see what they run and have a look at things close up. Maybe borrow one for a few laps etc.
Lipo cells are great because they aren't as tempramental as NiMh. You can charge them and leave them for days and they don;t lose any charge. You can also use the same pack again and again on the same day and they tend to get better each charge. They are a bit expensive compared to the old cells, but 2 packs will do you, where as you needed 4+ NiMH packs for a day.
Most modern ESC's are lipo compatible. this basically means they have a built in cut off at 6v. Below this voltage lipos tend to bugger up, so the ESC cuts power when they start to dump to protect the cells. I wouldn;t bother with your old speedo to be honest, just stick it on ebay see it you can get a few quid back
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