What you really want is for your magic to be
a) botchless, so that you can use it as much as you want and
b) spontaneous, so that you can use it for anything you want.
Ideally, you should also have decent casting totals, but only after a) and b) have been secured.
There are several avenues to that.
One is using "standard" non-fatiguing spontaneous magic, and trying to boost your totals. Charm Magic from HoH:MC (as suggested by callen) is probably your most efficient solution. Spell Foci from HoH:S (again, as suggested by callen) is slightly worse overall, but can be combined with the above, and it effectively "doubles up" any bonus you gain from your Talisman. Quiet Magic x 2 plus Subtle Magic helps; in fact, if I were your SG I'd allow you to take all three for fatigueless spontaneous magic at the cost of a single minor Virtue (see Deft small magics, below). Finally, keep in mind that you can extend the Range and Duration of your R:Touch, D:Conc Spontaneous spells with Rego Vim (N.B. not MuVi) magics, e.g. embedded in your Talisman.
Another approach is to go with fatiguing spontaneous magic, taking away the Fatigue with Diedne Magic, and removing the last botch die. This is notoriously tricky to do. I think the easiest path is to ensure you have access to Heroic Virtues (e.g. from the Story Flaw Legacy, see HoH:TL), then take Mythic Stamina (spellcasting). I think it's perfectly within the RAW, but some troupes frown upon it.
Yet another approach is to have someone/something else cast the spontaneous magics for you. Take the Minor Virtue Hermetic Theurgy (from HoH:MC), and use a (Formulaic) Invoke the Spirit of <Form> to summon a spirit that can then cast any type of Spontaneous Magic within that Form, without you spending fatigue or risking botches. There's plenty of ways to boost those ten Formulaic spells, and to remove the necessary Voice and Gestures - from Mastery to a Minor Focus to additional Theurgic Virtues, which I won't dwell upon. You do have to be careful to include any requisites you might want when you develop the Formulaic spell; and it does take you an extra round to instruct the Spirit (then again: do not think of summoning the spirit when you need it, think of almost unconsciously resummoning it as soon as its carried out a command, and keeping it around at D:Conc, with Conc "kept up" by a Sun or Moon length version of Mainitaining the Demanding spell). But overall, this is one method that allows you to routinely pull off 2nd magnitude spontaneous magic in every Form and Technique without fatigue or botches as a starting character.
Last but not least, just make up your own specialized Virtue(s). Nothing wrong with that, and it's probably the cleanest solution. I'd go for the following, which I think is fairly balanced.
Everyday Magic
Major, Hermetic
You are powerful in the least powerful magics. Double the final Casting Total of non-fatiguing spontaneous magic in non-stressful situations.
Deft Small Magics
Minor, Hermetic
You have developed a great facility with small magics. You are treated as having the appropriate Deft <Form> Virtue with any non-fatiguing Spontaneous Magic you cast.