SR16VE
The 1.6 L (1596 cc) SR16VE has Nissan's Neo VVL variable valve timing with lift control. It produces 175 PS (129 kW) @7800 rpm and 119 ft.lbf (161 Nm) @7200 rpm.
It is used in the following vehicles:
• N15 Nissan Pulsar VZ-R
• B14 Nissan Lucino VZ-R

SR16VE N1
This version was used in the limited-production (1000 produced) Nissan Pulsar VZ-R N1, produced from 1997 to 1998.
These cars were tuned by Autech Japan:
• 300 Lucino versions in series 1
• 200 Serie versions in series 1
• 300 Lucino versions in series 2
• 200 Serie versions in series 2
It made 200 PS (150 kW) @ 7800 rpm and 134 ft.lbf (181 Nm) @ 7600 rpm.

SR20VE
The 2.0 L SR20VE has Nissan's Neo VVL variable valve timing with lift control. It produces 190 PS (139 kW) @7000 rpm and 144 ft.lbf (196 Nm) @6000 rpm and later (2001-2003) 205 PS (150 kw) @7200 rpm and 206 nm @5200 rpm. It does not have 20 valves as is sometimes stated. Used in the following vehicles:
• 1998 P11 Nissan Primera 2.0G-V, 190 PS (139 kW)
• 2001-2003 P12 Nissan Primera, 205 PS (150 kW) 20V
• U14 Nissan Bluebird SSS, 190 PS (139 kW)
• Y11 JDM Nissan Wingroad ZV-S, 190 PS (139 kW)

SR20VET
The 2.0 L (1998 cc) SR20VET was the first turbocharged engine from Nissan with variable timing and lift control. It produces 280 PS (206 kW) @ 6400rpm and 309 nm @ 3200rpm. This motor was only produced in the Japanese market and is very hard to find.
It is used in the following vehicles:
• Nissan X-Trail GT

References:
http://en.wikipedia.org/wiki/Nissan_SR_engine

Factory Service Manuals can be found here