If your are aiming for High RPM usage, I would go with a Solid Roller (and I did for my car 7000-8000 Shift range). The reason being, Solid Rollers with properly adjusted Rocker Arms yield superior accuracy at Higher RPMS then Hyd. You also can start looking at more aggresive Lobe Lift on a cam so the valves can open/close faster. Over all if you can afford the investment in the Cam, Lifters, Springs then I say do it. Although I would not recommend driving it on the street.
In any case, if you are shooting for High RPMs, I suggest getting a nice Rocker Arm Girdle to aid in Top end stability plus endurance.
You asked about springs, well the ISKY Springs and Push Rods that I went with were excellent in quality and I can highly recommend them.
-James
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