i agree with what others have said.
it is my experience (largely observation) that we will clutter our spaces no matter how large. And the larger the space, the more work the upkeep is overall. this is why i've never wanted a house much larger than the one i have (currently 1300 sf, but i hope to have one that is about 15-1700 in living space with a garage for cars and a place to make biodiesel).
anyway, i find that the trick for me is to 1. monitor what comes in; 2. create a schedule for decluttering (i do big purges quarterly; i declutter each day--such as mail, etc--and each week--such as recycling, what not.); 3. set up a good organization system for yourself that is clearly labeled; and then 4. utilize this organization system.
for the first one, my husband and i are consciencious of our purchases. each thing needs to have a place and a function. I ask myself if i can utilize something that i already have (or refurbish something), or if it is something that i truly need or truly want. I do this with both small and large purchases. We find that we also save a lot of money this way. On impluse, i may buy this or that, but when i think about it (where will i wear this? where would i keep this? how often would i use it? etc) and i think about the savings and money market and IRA accounts, i am much more apt to desire to put that money there!
for the second one, a schedule for decluttering is great. i actually got this one from my mom. Right now, i'm itching to get started on a declutter, but am unable to do so because of time contraints. We used to do one before summer (prep for fall), before christmas (winter purge--also when we bought summer clothes because they were on mega sale), before easter (spring cleaning--part of our lenten processes, often had a toy focus), and then at the end of the school year (summer prep--often had a school paper focus). I still utilize this schedule today--and i don't feel 'quite right' if my home isn't purged by the start of the school year. LOL
Along with this, i do maintenance purges. Every day, i sort the mail into recycling, things that are shredded (i shred them right away and put them in the recycling or trash if the envelope had a plastic part), and then i have a place where i put the mail that we're keeping (file in the office for bank statements, etc; bill box for husband; coupon box in kitchen, etc).
Once a week, we go through the mail again (what we've kept) and we decide if we're going to get rid of coupons or other things. We also go through any papers that we've brought into the house and divide them into file away, recycle, or give/pass along (sometimes it's interesting articles, etc). We do the same with magazines (we often file them or pass them along or donate them to hospital, etc). We also bring in a lot of books--so we purge and reorganize quarterly in that regard--though every week we put the new books in a specific place so that we can read them and prep them for purging or shelving.
My organization system is actually made up of a motley group of 'hand me downs.' my sister and mother fitted out their closets originally with metal wire basket towers. I have these now. I currently utilize one--i passed along the other two to my friends. i also have plastic drawers and a number of plastic sweater boxes (extra large, large, and medium; some see through, others opaque). I have a single filing cabinet. Each of the sweater boxes and drawers are labeled clearly and kept in the closets (on the floor and above on the shelf). most of them are partially or even mostly empty.
then, the next step is to use this storage system. Each week when I do a purge, i utilize this system for things that i'm going to keep. For example, one box is entirely wrapping items for gifts. I put bags that i recieve in there (for recycling purposes), as well as any wrapping paper that i buy--though rare.
another box has christmas ornaments and such. My mother loves christmas and throughout the year buys me little 'goo gahs' for christmas. If i like them, they go in the box. If i don't like them, they'll go on ebay, but are stored in the box until they are going to be shipped out. So, utilize the storage that you have!
Good luck to you and congrats on your new home!