I'll destroy any RB20 with my SR on .5 bar.
Why the Eagle rods and pistons? S15 rods and pistons are more than enough and will probably be cheaper direct from Nissan.
Do the legwork yourself. You'll gain nothing but information and know how out of it and there's plenty of information on the net to prevent you from screwing anything up as long as you follow the step by step procedures, use the right tools and don't get ahead of yourself.
If I was going as far as to strip an entire motor apart I'd do alot more than rebuild it with OEM parts but that's just me...