I am also an ACO grandstand-er but you can sit/stand on the terraces in front for no more cost than the GE tickets. The problem is that you need to make your pitch early on and it takes several of you to do this successfully if you're going to be able to go for beer and food and visit the used beer department without giving up your spot. The other snag at that level is the bl**dy catch fencing which ruins all the pics from low down. Oh, and you'll get soaked by the TW*TS and choked by orange smoke once the cars set off.....
Those nice chaps at Team Langoustine who have set up the CA camp on BN have Sommer grandstand tickets for sale at a very reasonable price - I got two from them for some latecomer newbies this year. It's a grandstand that strikes me as being very well placed.