I'm interested in Goldy (either as R1 or R2) on the basis that Goldy may not leak as many points (if any) to Gawn like he did last year. Getting Goldy however, likely means that you're committed to missing out on Gawn (as it's likely you'll want to end up with Grundy) so it doesn't come without risk.
Gawn's ceiling average is very iffy this season due to Preuss. Does he get less TOG within games (Nic Nat style)? Can he average 115-120+ whilst getting possibly 30-40% time up forward? Does he get rested against weaker ruck opposition to keep him fresh later in the year (knowing Preuss can handle it)? He could fall back down to a 110 average. If that's the case, that's only possibly 5 ppg better than Goldy, even if he goes at a 105 avg.
Goldy has no genuine ruck backup, so the Roos would be pushing him to play every game (especially as they're more likely to be on the cusp of the 8 and needing to win games). If he's looking fully fit in the preseason, he could the obvious starting ruck in hindsight.
I think if I start Goldy, it's more likely at R2. I think Goldy is a chance to average around 105-110. If Grundy averages 125-130, I'd probably rather pay the $150k for the extra 20ppg + points earnt on VC loopholes.