I had the same decision to make about 6 months ago ....
I've read that the Titan can be a bit more difficult to integrate than the REL, and may need high pass filters (passive) between the preamp and power amp (which would be tricky if you have an integrated). Once integrated reviewers still felt the REL was more musical, but that the difference was small. I believe that the ACI is more powerful and will give higher SPL, but I have a small room and listen exclusively to music (no HT).
The RELs are very expensive in the US (seems to be a huge markup, given how strong the USD is at the moment) but after a few months of waiting I found a 6 month old Strata3 for $800 and it integrated perfectly with my floorstanders (spica angelus).
Obviously the first choice would be to do a home demo of both and decide if the REL is worth the extra cash or hunting around for on the used market.
In summary I think the REL is probably a safer bet and you have the choice to pay the extra and get a new REL or be patient and wait for a deal. The Titan may work just as well in your application so if ACI have a good return policy and you don't mind the hassle then try the ACI first ... you might save some money. However if ACI don't have a good return policy then I wouldn't get one without a home demo first, because if it doesn't integrate you'll hate it and eventually get rid of it at a big loss.
I've read that the Titan can be a bit more difficult to integrate than the REL, and may need high pass filters (passive) between the preamp and power amp (which would be tricky if you have an integrated). Once integrated reviewers still felt the REL was more musical, but that the difference was small. I believe that the ACI is more powerful and will give higher SPL, but I have a small room and listen exclusively to music (no HT).
The RELs are very expensive in the US (seems to be a huge markup, given how strong the USD is at the moment) but after a few months of waiting I found a 6 month old Strata3 for $800 and it integrated perfectly with my floorstanders (spica angelus).
Obviously the first choice would be to do a home demo of both and decide if the REL is worth the extra cash or hunting around for on the used market.
In summary I think the REL is probably a safer bet and you have the choice to pay the extra and get a new REL or be patient and wait for a deal. The Titan may work just as well in your application so if ACI have a good return policy and you don't mind the hassle then try the ACI first ... you might save some money. However if ACI don't have a good return policy then I wouldn't get one without a home demo first, because if it doesn't integrate you'll hate it and eventually get rid of it at a big loss.