Congrats 4may!
The big ticket items are of course the cot, stroller/travel system and car seat. If you are splurging, a bassinet or small rocker is a nice thing to have. We used the Tiny Love vibrating rocker. Both my girls loved it, and my nephew is currently using ours:)
Another nice to have, but I almost want to say essential big ticket item is a comfortable rocking armchair that you can use to sit with baby when feeding and rock him to sleep, unless you are going to be one of those lucky ones that you just put baby down and s/he sleeps

Then you just need a comfortable armchair.
On the smaller items, you can go crazy and buy every gadget and gimmick out there, or just focus on the essentials. There is sooo much stuff out there.
The one thing I definitely recommend is a properly stocked medicine case, with things like fever and pain meds, teething gels/powders, plasters, arnica gel, rash cream, saline spray, infant illiadin, etc, etc. Best to get this closer to the time, so that meds don't expire within 3 months of having baby. Also, you will need to get what is age appropriate now, and replace with other meds as s/he gets older.
Keep in mind that you will have a baby shower, so don't buy everything yet, as people may want to give you some nice things as gifts.