If you don't have it ready, you absolutely should wait. It's like $30 on 3DS last time I checked and the console versions are $20 more with a decent amount of extra content. Good deal in my opinion. Playing on a TV is a major selling point. If you don't get the Wii U version, you miss out on how much the touchscreen adds to the game, but it's probably more than playable without it.
Your pricing estimate is off. Amazon.com has it for $20 right now and prices have dipped under $15 occasionally - a steal of a deal for one of the best games on 3DS.
Although I agree that the console versions sound awesome and will add some great content (including new weapons, new characters for Raid Mode, a new enemy, a new difficulty setting, and random enemy placement in some mode) the pricing and immediate availability of the 3DS game makes it an appealing alternative.
Plus you get 3D graphics in the portable version without needing a 3D-capable TV setup - and Resident Evil Revelations looked really good in 3D! Not yet sure if console versions will have 3D support.