I will be upgrading from a 125g undrilled tank to a 215g drilled tank in a few months.
The undrilled with regular overflow boxes actually didn't bother me much until I had to make screen lids for the tank (got 'flying fish' now ;) ). I think the 'reef-ready' (meaning drilled) will be nice though.
If you are buying used inquire about scratches and potential defects. For example I will be selling my 125g cheap because it does have some scratches on the front and whoever will get it should probably turn it around and make that the backside. So if you buy used identifying small defects can save you money.
Bracing... I got bracing now and will have bracing on the new tank. It bothers me mostly in regards to feeding but the price difference and weight difference is just too big to go with a brick tank (brick meaning super thick glass sides that don't require any center bracing)
There's also the glass itself to consider. Some people really like starfire (low iron content) glass because it distorts the colors less but I figure I got so many blue and purple bulbs a little greenish tint from the glass will be acceptable.
Do you want glass or acrylic? Personally I prefer glass. Acrylic scratches even easier. On the plus side you can fix scratches in acrylic but not scratches in glass...