When I built my 572" hemi 12 years ago, the two main guys I consulted w/ during the planning phase both recommended me to go w/ a flat tappet cam b/c of all the street use it was gonna see. I stuck to my guns and went solid roller and have never once been upset about it. If you buy GOOD parts, you'll be fine. Yes, the roller is definitely more expensive, but so is going through an engine again after a lobe goes flat.
You can't run a big nasty solid roller lobe w/ $400 lifters and expect it to live long.