I like Sue's answer. If you can't get a 48 v supply at >2 amps, you could do what another poster did: use a $9.95 12 volt 10 amp supply from MPJA (15625 PS) and make 333 strings of 3 LEDs with a 51 ohm resistor in series with each string. He even posted the artwork for his PC board on ABSE.
I would also suggest fusing your branch circuits and your main power supply should also be protected from overcurrent. The power supply for 1000 LED's is going to be enough to concentrate a large amount of power in a very small area during a short and will cause a hot arc to form should there be a fault. Typically the spacing on a circuit board for low voltage, individually low current devices is very tight, which is fine if polarity is observed and there are no shorts from loose solder/debris.
you may use also four 24 V supplies with 0.8 A each. Each supply for 200 leds in 40 groups of 5 leds in series. You should think about total power too, with 48 V you need 96 W, with 12 V 120 W, and with 24 V 76.8 W. There is an error, you only need 6,66 A with 12 V or 79.92 W.