Spark Plugs
Also check out the second episode (around 5:40 into this episode) of the Wheeler Dealers TV series, for a great demo in replacing the spark plugs.
Spark Plug Wires
Popular brands are either OEM (Toyota) or NGK. Toyota are a little more expensive, but tend to sit more snugly and thus are minimally better at keeping water out :)
Spark Plugs
The BRB suggests using platinum plugs, which last around 60,000 miles, and are quite expensive ($50). Copper is more conductive, but they last only a few thousand miles (and cost less than $2 for one) – just change them when you change your Oil and Oil Filter.
General spark plug information is available at the NGK FAQ
Gapping
Copper plugs are more conductive than platinum so there is less of a voltage drop across them which gives you a little more room before they start to missfire. Reducing the gap reduces the resistance across the gap, providing more room before a missfire.
Many plugs come pre-gapped, but check them anyway. Gap to 0.044" (0.040" is fine).
Denso
Denso copper #3009.
NGK
NKG-6097 or the BKR7E, both around $10 for 4. They are basically the same thing. You can order them from Sparkplugs.com, or get them from NAPA.
If you boost over 14psi, you would use colder, BKR7 series plugs. Otherwise you are ok with BKR6 series. Stock SC cars boost at 8psi.
BRK6 range
Unless specified the BKR6 are pre-gapped to 0.034".
PLATINUM
BKR6EP-8…2215 OR 3183 (BGB recommended)
BKR6EP-11…2978 OR 4134 (same as above, just need to regap, since -11 stands for .044" gap)
BKR6EVX…3539 (“high performance platinum” (VX) version of the above)
BKR6EVX-11…3540 (same as 3539, but gapped to .044)
COPPER
BCPR6ES-11…6779
BKR6E…6962 (same as BGB recommended plug, but in copper)
BKR6E-11…2756 (above gapped to .044")
BKR6ES…3783 (same as above, but has a standard 3/4" Thread reach and 2.5 mm center electrode.
BKR6ES-11…5553 (same as 3783, but gapped to .044")
BRK7 range
Unless specified the BKR7 are pre-gapped to 0.034".
PLATINUM
BKR7EVX-11…4685 (same as 3539, but colder)
COPPER
BKR7E…6097 (same as 6962, but colder)
BKR7E-11…1283 (same as 2756, but colder)
BKR7ES-11…2387 (same as 5553, but also colder)