I generally wouldn't advise anyone away from the piranha tooth bar as 98% of what i've heard about it is good and I don't actually think i've heard anyone say they regretted purchasing it.. plus as 'implements' go it's cheap! I know it's not exactly an implement but a straight edge bucket and a tooth bucket are debatably two different things, so it sort of falls in there.
But.. if your main purpose for the tooth bar was having to do with brush removal and you're getting a grapple anyway, i might skip the tooth bar for the initial round of purchases if $300 makes a difference to you. Neither the piranha style tooth bar or the lower tines on many grapples are ideal for 'digging' but they might be comparable good at it in my mind (ive used neither yet). Plus I think if your brush is large enough to 'grip' with the grapple you'll do better in rocky ground grabbing over top of it and rolling the tractor slightly forwards and backwards while trying to curl up with closed grapple, than you would by digging into the roots with a tooth bar.
I'll propose another idea. I think the tooth bar is around $300. A Titan stump bucket is $600-700 (it went up recently i guess, its been ~$550 for the past 2 years). If you have SSQA you might consider swinging the few hundred extra to get a dedicated digging/prying bucket. The Titan one is somewhat unique among stump buckets in that it has a single narrow 'tip/tooth' and narrower front bucket walls than most of them which will maximize your initial ground penetration. I would say its just about a highly reviewed as the piranha is. Does depend on having SSQA!
I have box blade and angle blade. I think the angle blade may ultimately be more versatile for you, but if i had an angle blade and no box blade and wanted to keep it that way I'd probably modify my angle blade for removable side walls and (reversible!) gauge wheels. It definitely has its tricks. I think using the blade reversed, and changing top link setting, are the low hanging fruit i dont see many people mentioning. The top link length controls the aggressiveness of the cutting (blade facing forward) or spreading (blade facing backward) just like it does on a box blade. Making the implement unlevel front to back by changing the top link setting also causes one side of the blade to rise the and the other to lower when it is angled. If you have a power top link and not a power side link that may be tempting at times to get some crowning effect, but it does mix the side tilt and blade angle to the ground together since moving the top link also affects the aggressiveness of the blade. I think another thing to consider is IF: a. you're not getting a box blade, and b. you're not getting a stump bucket, THEN: I would consider getting some kind of dedicated single ripper thing for the 3pt to help deal with rocks and roots that the loader REALLY isn't suited for (in the absence of a stump bucket). Box blades usually come with rippers which, while they have limited depth, can be used for this to a point.