SLP is actually coming out with a totally new re-designed set that fixes their clearance issue and outflows almost all of the competitors.
I have done a couple, they are not that bad. Go with long tubes over shortys, you will be haapier in the long run.
Getting them in can be a little tricky, on certian cars there is a tab on the block on the driver's side that can be ground down some, and they will slide right in. Or, you can remove the steering shaft which somepeople do not like to do, having done it both ways I would honestly say it's a toss up which one you choose. Try not to break a header bolt, if you don't have access to a welder getting it out will be a pain.
Cost efective = Pacesetter or hooker.
Best Quality = Kooks or SLP.