AH,AH!
Just admit it, that you are a lush
Your Maxxum 400si is a very good camera...some Pro that uses Minota, have the 400si as a backup body, because it is simple to use and light weight.
The 400si is a great camera that can?t be beat by any other cameras. A great photographer once said
?a camera is just a black film storage box...the person behind the box is what make the picture?. I once produce a beautiful 8?x10? image using a 2?x2? cardboard box as a pinhole camera, and it was extremely sharp & clear my class mates & photo prof though I uses a large format camera (4x5). I wouldn?t worry about changing the camera, unless you need to have a camera that survive a drop from a cliff (don?t buy into the adds). What you should do is carry that camera every where with you and takes lots of pictures. And, if you must spend money...then get a good flash for fill flash (Vivitar 283 or 285 is relatively inexpensive for it power...I like the 283 better, because it is easier to carry around & is simpler with out the annoying hood).
Here is the secret to success (I use to teach photography classes).
* Carry the camera with you where ever you go. (Sleep with it, take it to bed, but don?t use the foot massager on it

)
* Spend at least 15min looking at the scene before you take the picture (after the first few rolls you could cut it down to 5min)
* Have a note pad to record all info for the images as you capture it (f:stop, shutter speed, lens size, film speed, flash or no flash, weather condition, in/out door, at least 1 sentence describe the scene & why you have the urge to capture it).
* Make a promise to your self to take at least 3 shots a day and no more than 5.
* Develop the roll at the end of week and make a contact sheet.
* Study the density of the negative, compare it to the contact sheet, and the notes that you have record during the shoot (write down all infos, neg density, contact quality, etc...)
* Crit your own contact sheet, then have friends & family crit your contact sheet (record the pro & con of the crit)
* Make three 8?x10? of your best images, and record all info on the process ( f:stop, time, paper type & grade, dogging & burning.
* Crit & compare the prints to the contact sheet, neg density, crit info & notes, then have friends & family crit it (make sure your record all pros & cons).
Repeat the above steps for 3~4 rolls of film, Compare your progress and have crits of the finish images & contact sheets.
** And, make sure to look for large field/area of one dominate colours, contrast when your take the picture (light & dark, thick & thin, texture, sharp & smooth).
*** More can be less & less can be more...move closer to the image (cropt tight) and do not use a zoom (strictly 50mm)
If you are diligent with the above process I guarantee you that you will be a much better photographer after 1 month.
Ps. If you don?t have a darkroom, then you could skip the contact sheet steps & have to live with 4?x6? prints.
Come back and post your pics in a month here so we could see your improvements.
Good luck!