I like Report as well, propably a must buy on a 3/4 opening, though. I do not think you should be able to gain cards costing . The difference between and is that you cannot open with a card barring edge cases, during the course of the game the difference tends to become marginal. The Chancellor effect on this card with the strong gaining is huge early on as well. Comparing Report to Annex (gain a Duchy and shuffle all but up to 5 cards into your deck for ), I do not think Report needs a buff anyway.
I felt that Report was rather different than Annex. There you gain a card you don't want in your shuffle and the Events keeps it out of it. Here you can gain cards you want in your shuffle and the Event puts it in. In some way, Annex is even a (supporting) strategy: You gain Duchies that don't go into your deck immediately. I don't see Report doing that.
It's true that Report as well as Parting go in a similar niche, opening-wise, as both allow $3/$4 openings to be $5 openings. You can not usually open with a Gold, except of course that there are already cards which change that (Baker, for example). Allowing to gain a Gold would probably be a rather big difference, as the Gold would help you pay back that debt. Given Wedding costs $4<3>, which is neither strictly less nor more, but gives a VP (compare Chancellor, a weak $3, and Monument, a standard $4), maybe that would still be fine.
Report trades Overlord's flexbility for a chance at getting to your $5 sooner, and may be used near the endgame for Duchies. Doesn't seem like it adds much but probably ok for an event. Maybe if the $5 was top decked; that would make openings even more weird and the Duchy gaining less enticing compared to Annex (but still valid).
That would be another good alternative to allowing the Gold gain. It also spices things up a bit.
I haven't tried it much yet, so we'll see whether it actually needs a buff soon, i hope.
Report seems cool.
update the VP
Just leaked that another landmark is coming soon.
Truth be told, i am very uninspired at doing Landmarks. I think they are a cool mechanic, but my only attempt at one was just actually something somebody else (fragasnap) had done before. So i wouldn't count on it. Heh, how about a Seasons-Landmark, that makes card X worth more if the game ends in year 2? But seriously, i have nothing cooking here.