the SX boston's don't need a lot of power, 50-75rms is more than enough to push them sufficiently. i don't know who you've been talking to, but the boston's will have way more midbass than the alpines, and bright? i have not personally heard the F#1 speakers, and for the kinda cash that they cost they better be the exception, but i have not heard a set of alpines, with any power combination, that doesn't sound like you're listening to them through a tin can. their type r subs are decent. speakers? i wouldn't have them. we've carried boston and alpine speakers at the shop (amongst others) for ever, and anybody that actually listens to the alpines compared to the boston speakers will pick the bostons every single time, regardless of price. the bostons are a better speaker, hands down.
having said that, if you already own the alpines, then by all means you should use them. you already paid for them, so go with it. if you like them, then great. if you're not happy with their performance, then look into something else and sell the alpines. there are a lot of great speakers out there, just take it as a lesson learned and ignore all price tags, listen to several different sets of speakers, side by side if possible, and then make your decision. i always tell customers to close their eyes and just listen to speaker A and B... which one do you liek better. funny thing is, a lot of times, the speaker that sounds better to them, isn't necessarily the most expensive. but if it is more than you have to spend, then save your money, and come back when you do have enough. becaue you will always remember that XXXXXX is the speaker you reeeaaaally want, but didn't have the cash, so settled for YYYYYYYYYYY instead. you will eventually end up getting your original choice, but after a lot of extra money spent on other speakers you settled on because they were cheaper. in the end, if you do it right the first time, you won't have to worry about upgrading time and time again until you get ot the same point anyways.