Ya....definitely get it drilled now when you have the chance.
When I got my drilled 180, my 135 Reef tank became an FOWLR. I shoulda got the 135 drilled then 'cause the HOB skimmer I have on there is a POS. Eventually it's gonna need a sump with a bigger skimmer in there. Have 4 Triggers in there and so far it's been okay. Been up and running for 4 months. the Triggers are still juvies and Nitrates are holding at 10 ppm, but that ain't gonna last I reckon.
I've made this mistake (not drilling when chance was there) twice, now.
Oh well, the wallet was only so thick at the time and still have yet to get a decent skimmer on the 180. All in due time, I suppose.
But I digress.
Ya. Get it drilled.
Cheers
,