Lady in Red and a quest for advice please

My sister in law, well sort of as she is my step brothers fiancée, is 40 next month so I made her a card, although again I haven’t decided whether to put a big 40 on it as I like the clean lines. If I do I’m not sure whether I should put it top or bottom corner or even near the oval of the image either top or bottom so I’m walking away at the mo until I decide, again open to suggestions, all you clever seasoned crafters.

The image is a whiff of joy coloured again with Promarkers and some sparkle added with sakura glaze pens. The red mirri card is from my stash as is the silver and red ribbon, the bow I attached with diamond glaze. Another very clean and simple card but I actually feel most comfortable with them, and as I haven’t had much time for crafting of late it just feels right.

I would like to enter this card into the following challenges:-

Come and get it-anything goes

Stamp,scrap, doodle-monochromatic

Shelly's images-monochromatic plus ribbon
Southern girls-inspired by a song (lady in red)
Freshly Brewed-anything goes
I love promarkers-glitter and glitz
scrapbook sisters-anything goes
Whimsy inspiration-monochromatic
ribbon carousel challenge -use a spooled item
Bows and berries-clean and simple

Now my quest for advice, I have a bigshot and have very few dies and have decided to take the plunge and buy some spellbinders dies but I'm so over whelmed by all the different shapes, please can anyone give me some adcive as to which would be a good place to start and what shapes you think I might get most use out of as some look quite small and I'm not sure how I'd use them, thanks in advance to all you lovely peeps. 

Thanks for the help guys.