For SRP you may want my custom-made SRP which uses 1.01 but removes some of the derpy changes they made to weapon upgrades - let me know if you play CS and I'll upload it somewhere. Get SRP 1.00 for CS and the latest ZRP for SOC, both are musts for bug-fixing. Each one has something going for it, and while CS is the weakest, what it does well is worth seeing (especially ball-busting anomalies. Just play in chronological order CS, SOC, COP.
Swamps are also an awesome area with TONS of hidden stuff to find if you thoroughly explore, probably the best area in the entire series for sheer exploration. Endgame sucks, but that's a staple of the series (COP's not too bad though). It's the most actiony, but it also is the one that does night best (very dark) and the only one where anomalies are TRULY deadly. It has some great atmospheric moments (Red Forest) and some you-gonna-get-raped hard moments (that fucking machine gunner). CS is good and only faggots skip it (even the lovable ones it seems).
