i purchased the original D4 like you. The only upgrade i would recommend for it if you plan to race it is the worlds slipper clutch, as this is a huge improvement on the standard item and makes the car far more predictable on power.
for the electrics, keep an eye on the for sale section here. decent transmitters and servos etc come up often. I got a pair of £90 KO 2123 for £30 each on ebay also.
should be able to pick up the older KO esprit vantage radio for small money now and it is still plenty good enough.
Brushless systems also come up a fair bit, unless you want brand new.
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